diff --git a/mobile/envoy_build_config/BUILD b/mobile/envoy_build_config/BUILD
index 3419a753b273..a9fd1b483207 100644
--- a/mobile/envoy_build_config/BUILD
+++ b/mobile/envoy_build_config/BUILD
@@ -2,7 +2,6 @@ load(
     "@envoy//bazel:envoy_build_system.bzl",
     "envoy_cc_library",
     "envoy_mobile_package",
-    "envoy_select_enable_http3",
     "envoy_select_envoy_mobile_listener",
 )
 
@@ -21,6 +20,7 @@ envoy_cc_library(
         "extension_registry_platform_additions",
         "@envoy//source/common/http/matching:inputs_lib",
         "@envoy//source/common/network:socket_lib",
+        "@envoy//source/common/quic:quic_transport_socket_factory_lib",
         "@envoy//source/common/router:upstream_codec_filter_lib",
         "@envoy//source/common/tls/cert_validator:cert_validator_lib",
         "@envoy//source/common/upstream:default_local_address_selector_factory",
@@ -52,12 +52,7 @@ envoy_cc_library(
         "@envoy_mobile//library/common/extensions/key_value/platform:config",
         "@envoy_mobile//library/common/extensions/listener_managers/api_listener_manager:api_listener_manager_lib",
         "@envoy_mobile//library/common/extensions/retry/options/network_configuration:config",
-    ] + envoy_select_enable_http3(
-        [
-            "@envoy//source/common/quic:quic_transport_socket_factory_lib",
-        ],
-        "@envoy",
-    ) + envoy_select_envoy_mobile_listener(
+    ] + envoy_select_envoy_mobile_listener(
         [
             "@envoy//source/extensions/udp_packet_writer/default:config",
             "@envoy//source/common/listener_manager:listener_manager_lib",
diff --git a/mobile/envoy_build_config/extension_registry.cc b/mobile/envoy_build_config/extension_registry.cc
index 7d6fc32fa0a8..8069fa349d4d 100644
--- a/mobile/envoy_build_config/extension_registry.cc
+++ b/mobile/envoy_build_config/extension_registry.cc
@@ -36,7 +36,6 @@
 #include "source/common/listener_manager/connection_handler_impl.h"
 #endif
 
-#ifdef ENVOY_ENABLE_QUIC
 #ifdef ENVOY_MOBILE_ENABLE_LISTENER
 #include "source/common/quic/server_codec_impl.h"
 #include "source/extensions/quic/connection_id_generator/envoy_deterministic_connection_id_generator_config.h"
@@ -44,9 +43,8 @@
 #include "source/extensions/quic/proof_source/envoy_quic_proof_source_factory_impl.h"
 #include "source/extensions/udp_packet_writer/default/config.h"
 #endif
-#include "source/common/quic/quic_client_transport_socket_factory.h"
-#endif
 
+#include "source/common/quic/quic_client_transport_socket_factory.h"
 #include "extension_registry_platform_additions.h"
 #include "library/common/extensions/cert_validator/platform_bridge/config.h"
 #include "library/common/extensions/filters/http/local_error/config.h"
@@ -182,8 +180,6 @@ void ExtensionRegistry::registerFactories() {
   Server::FilterChain::forceRegisterFilterChainNameActionFactory();
 #endif
 
-#ifdef ENVOY_ENABLE_QUIC
-
 #ifdef ENVOY_MOBILE_ENABLE_LISTENER
   // These are QUIC downstream factories required if Envoy Mobile is compiled with
   // proxy functionality and QUIC support.
@@ -195,8 +191,8 @@ void ExtensionRegistry::registerFactories() {
   Quic::forceRegisterEnvoyQuicProofSourceFactoryImpl();
   Quic::forceRegisterEnvoyDeterministicConnectionIdGeneratorConfigFactory();
 #endif
+
   Quic::forceRegisterQuicClientTransportSocketConfigFactory();
-#endif
 }
 
 } // namespace Envoy
diff --git a/mobile/library/cc/engine_builder.cc b/mobile/library/cc/engine_builder.cc
index ac4cb04e13f5..15ec80552f6e 100644
--- a/mobile/library/cc/engine_builder.cc
+++ b/mobile/library/cc/engine_builder.cc
@@ -44,11 +44,7 @@
 namespace Envoy {
 namespace Platform {
 
-EngineBuilder::EngineBuilder() : callbacks_(std::make_unique<EngineCallbacks>()) {
-#ifndef ENVOY_ENABLE_QUIC
-  enable_http3_ = false;
-#endif
-}
+EngineBuilder::EngineBuilder() : callbacks_(std::make_unique<EngineCallbacks>()) {}
 
 EngineBuilder& EngineBuilder::setNetworkThreadPriority(int thread_priority) {
   network_thread_priority_ = thread_priority;
@@ -61,7 +57,6 @@ EngineBuilder& EngineBuilder::setUseCares(bool use_cares) {
   return *this;
 }
 #endif
-
 EngineBuilder& EngineBuilder::setLogLevel(Logger::Logger::Levels log_level) {
   log_level_ = log_level;
   return *this;
@@ -192,7 +187,6 @@ EngineBuilder& EngineBuilder::enableSocketTagging(bool socket_tagging_on) {
   return *this;
 }
 
-#ifdef ENVOY_ENABLE_QUIC
 EngineBuilder& EngineBuilder::enableHttp3(bool http3_on) {
   enable_http3_ = http3_on;
   return *this;
@@ -223,8 +217,6 @@ EngineBuilder& EngineBuilder::enablePortMigration(bool enable_port_migration) {
   return *this;
 }
 
-#endif
-
 EngineBuilder& EngineBuilder::setForceAlwaysUsev6(bool value) {
   always_use_v6_ = value;
   return *this;
@@ -382,14 +374,10 @@ std::unique_ptr<envoy::config::bootstrap::v3::Bootstrap> EngineBuilder::generate
 
   // Set up the optional filters
   if (enable_http3_) {
-#ifdef ENVOY_ENABLE_QUIC
     envoy::extensions::filters::http::alternate_protocols_cache::v3::FilterConfig cache_config;
     auto* cache_filter = hcm->add_http_filters();
     cache_filter->set_name("alternate_protocols_cache");
     cache_filter->mutable_typed_config()->PackFrom(cache_config);
-#else
-    throw std::runtime_error("http3 functionality was not compiled in this build of Envoy Mobile");
-#endif
   }
 
   if (gzip_decompression_filter_) {
diff --git a/mobile/library/cc/engine_builder.h b/mobile/library/cc/engine_builder.h
index 174a57a8b2df..748c9cb1fc66 100644
--- a/mobile/library/cc/engine_builder.h
+++ b/mobile/library/cc/engine_builder.h
@@ -56,14 +56,12 @@ class EngineBuilder {
   EngineBuilder& enableGzipDecompression(bool gzip_decompression_on);
   EngineBuilder& enableBrotliDecompression(bool brotli_decompression_on);
   EngineBuilder& enableSocketTagging(bool socket_tagging_on);
-#ifdef ENVOY_ENABLE_QUIC
   EngineBuilder& enableHttp3(bool http3_on);
   EngineBuilder& setHttp3ConnectionOptions(std::string options);
   EngineBuilder& setHttp3ClientConnectionOptions(std::string options);
   EngineBuilder& addQuicHint(std::string host, int port);
   EngineBuilder& addQuicCanonicalSuffix(std::string suffix);
   EngineBuilder& enablePortMigration(bool enable_port_migration);
-#endif
   EngineBuilder& enableInterfaceBinding(bool interface_binding_on);
   EngineBuilder& enableDrainPostDnsRefresh(bool drain_post_dns_refresh_on);
   // Sets whether to use GRO for upstream UDP sockets (QUIC/HTTP3).
diff --git a/mobile/library/jni/jni_impl.cc b/mobile/library/jni/jni_impl.cc
index 0e0c21d17e93..6465a2ec0d65 100644
--- a/mobile/library/jni/jni_impl.cc
+++ b/mobile/library/jni/jni_impl.cc
@@ -1229,7 +1229,6 @@ void configureBuilder(Envoy::JNI::JniHelper& jni_helper, jlong connect_timeout_s
   builder.enableGzipDecompression(enable_gzip_decompression == JNI_TRUE);
   builder.enableBrotliDecompression(enable_brotli_decompression == JNI_TRUE);
   builder.enableSocketTagging(enable_socket_tagging == JNI_TRUE);
-#ifdef ENVOY_ENABLE_QUIC
   builder.enableHttp3(enable_http3 == JNI_TRUE);
   builder.setHttp3ConnectionOptions(
       Envoy::JNI::javaStringToCppString(jni_helper, http3_connection_options));
@@ -1245,8 +1244,6 @@ void configureBuilder(Envoy::JNI::JniHelper& jni_helper, jlong connect_timeout_s
     builder.addQuicCanonicalSuffix(suffix);
   }
   builder.enablePortMigration(enable_port_migration);
-
-#endif
   builder.setUseCares(use_cares == JNI_TRUE);
   builder.setUseGroIfAvailable(use_gro == JNI_TRUE);
   builder.enableInterfaceBinding(enable_interface_binding == JNI_TRUE);
diff --git a/mobile/library/objective-c/EnvoyConfiguration.mm b/mobile/library/objective-c/EnvoyConfiguration.mm
index bf3591564782..eb804f48c095 100644
--- a/mobile/library/objective-c/EnvoyConfiguration.mm
+++ b/mobile/library/objective-c/EnvoyConfiguration.mm
@@ -166,7 +166,6 @@ - (instancetype)initWithConnectTimeoutSeconds:(UInt32)connectTimeoutSeconds
     builder.addPlatformFilter([filterFactory.filterName toCXXString]);
   }
 
-#ifdef ENVOY_ENABLE_QUIC
   builder.enableHttp3(self.enableHttp3);
   for (NSString *host in self.quicHints) {
     builder.addQuicHint([host toCXXString], [[self.quicHints objectForKey:host] intValue]);
@@ -174,7 +173,6 @@ - (instancetype)initWithConnectTimeoutSeconds:(UInt32)connectTimeoutSeconds
   for (NSString *suffix in self.quicCanonicalSuffixes) {
     builder.addQuicCanonicalSuffix([suffix toCXXString]);
   }
-#endif
 
   builder.enableGzipDecompression(self.enableGzipDecompression);
   builder.enableBrotliDecompression(self.enableBrotliDecompression);
diff --git a/mobile/library/swift/EngineBuilder.swift b/mobile/library/swift/EngineBuilder.swift
index f8ee3891ed82..e2e0ca1b6e6c 100644
--- a/mobile/library/swift/EngineBuilder.swift
+++ b/mobile/library/swift/EngineBuilder.swift
@@ -4,7 +4,6 @@ import Foundation
 /// Builder used for creating and running a new Engine instance.
 @objcMembers
 open class EngineBuilder: NSObject {
-  // swiftlint:disable:previous type_body_length
   private var engineType: EnvoyEngine.Type = EnvoyEngineImpl.self
   private var logLevel: LogLevel = .info
   private var connectTimeoutSeconds: UInt32 = 30
@@ -18,11 +17,7 @@ open class EngineBuilder: NSObject {
   private var dnsCacheSaveIntervalSeconds: UInt32 = 1
   private var enableGzipDecompression: Bool = true
   private var enableBrotliDecompression: Bool = false
-#if ENVOY_ENABLE_QUIC
   private var enableHttp3: Bool = true
-#else
-  private var enableHttp3: Bool = false
-#endif
   private var quicHints: [String: Int] = [:]
   private var quicCanonicalSuffixes: [String] = []
   private var enableInterfaceBinding: Bool = false
@@ -174,7 +169,6 @@ open class EngineBuilder: NSObject {
     return self
   }
 
-#if ENVOY_ENABLE_QUIC
   /// Specify whether to enable support for HTTP/3 or not.  Defaults to true.
   ///
   /// - parameter enableHttp3: whether or not to enable HTTP/3.
@@ -208,7 +202,6 @@ open class EngineBuilder: NSObject {
     self.quicCanonicalSuffixes.append(suffix)
     return self
   }
-#endif
 
   /// Specify whether sockets may attempt to bind to a specific interface, based on network
   /// conditions.
diff --git a/mobile/test/cc/unit/envoy_config_test.cc b/mobile/test/cc/unit/envoy_config_test.cc
index 376ba54d7591..97958a679883 100644
--- a/mobile/test/cc/unit/envoy_config_test.cc
+++ b/mobile/test/cc/unit/envoy_config_test.cc
@@ -64,16 +64,13 @@ bool socketAddressesEqual(
 
 TEST(TestConfig, ConfigIsApplied) {
   EngineBuilder engine_builder;
-  engine_builder
-#ifdef ENVOY_ENABLE_QUIC
-      .setHttp3ConnectionOptions("5RTO")
+  engine_builder.setHttp3ConnectionOptions("5RTO")
       .setHttp3ClientConnectionOptions("MPQC")
       .addQuicHint("www.abc.com", 443)
       .addQuicHint("www.def.com", 443)
       .addQuicCanonicalSuffix(".opq.com")
       .addQuicCanonicalSuffix(".xyz.com")
       .enablePortMigration(true)
-#endif
       .addConnectTimeoutSeconds(123)
       .addDnsRefreshSeconds(456)
       .addDnsMinRefreshSeconds(567)
@@ -101,7 +98,6 @@ TEST(TestConfig, ConfigIsApplied) {
       "dns_failure_refresh_rate { base_interval { seconds: 789 } max_interval { seconds: 987 } }",
       "connection_idle_interval { nanos: 222000000 }",
       "connection_keepalive { timeout { seconds: 333 }",
-#ifdef ENVOY_ENABLE_QUIC
       "connection_options: \"5RTO\"",
       "client_connection_options: \"MPQC\"",
       "hostname: \"www.abc.com\"",
@@ -110,7 +106,6 @@ TEST(TestConfig, ConfigIsApplied) {
       "canonical_suffixes: \".xyz.com\"",
       "num_timeouts_to_trigger_port_migration { value: 4 }",
       "idle_network_timeout { seconds: 30 }",
-#endif
       "key: \"dns_persistent_cache\" save_interval { seconds: 101 }",
       "key: \"always_use_v6\" value { bool_value: true }",
       "key: \"prefer_quic_client_udp_gro\" value { bool_value: true }",
@@ -191,13 +186,11 @@ TEST(TestConfig, SetSocketTag) {
   EXPECT_THAT(bootstrap->DebugString(), HasSubstr("http.socket_tag.SocketTag"));
 }
 
-#ifdef ENVOY_ENABLE_QUIC
 TEST(TestConfig, SetAltSvcCache) {
   EngineBuilder engine_builder;
   std::unique_ptr<Bootstrap> bootstrap = engine_builder.generateBootstrap();
   EXPECT_THAT(bootstrap->DebugString(), HasSubstr("alternate_protocols_cache"));
 }
-#endif
 
 TEST(TestConfig, StreamIdleTimeout) {
   EngineBuilder engine_builder;
@@ -311,26 +304,15 @@ TEST(TestConfig, DisableHttp3) {
   EngineBuilder engine_builder;
 
   std::unique_ptr<Bootstrap> bootstrap = engine_builder.generateBootstrap();
-#ifdef ENVOY_ENABLE_QUIC
   EXPECT_THAT(bootstrap->ShortDebugString(),
               HasSubstr("envoy.extensions.filters.http.alternate_protocols_cache.v3.FilterConfig"));
-#endif
-#ifndef ENVOY_ENABLE_QUIC
-  EXPECT_THAT(
-      bootstrap->ShortDebugString(),
-      Not(HasSubstr("envoy.extensions.filters.http.alternate_protocols_cache.v3.FilterConfig")));
-#endif
-
-#ifdef ENVOY_ENABLE_QUIC
   engine_builder.enableHttp3(false);
   bootstrap = engine_builder.generateBootstrap();
   EXPECT_THAT(
       bootstrap->ShortDebugString(),
       Not(HasSubstr("envoy.extensions.filters.http.alternate_protocols_cache.v3.FilterConfig")));
-#endif
 }
 
-#ifdef ENVOY_ENABLE_QUIC
 TEST(TestConfig, UdpSocketReceiveBufferSize) {
   EngineBuilder engine_builder;
   engine_builder.enableHttp3(true);
@@ -392,7 +374,6 @@ TEST(TestConfig, UdpSocketSendBufferSize) {
   EXPECT_TRUE(snd_buf_option->type().has_datagram());
   EXPECT_EQ(snd_buf_option->int_value(), 1452 * 20);
 }
-#endif
 
 TEST(TestConfig, EnablePlatformCertificatesValidation) {
   EngineBuilder engine_builder;