diff --git a/Google.Api.Generator/Program.cs b/Google.Api.Generator/Program.cs
index 448fb2fd..ea4904d3 100644
--- a/Google.Api.Generator/Program.cs
+++ b/Google.Api.Generator/Program.cs
@@ -39,7 +39,8 @@ public static class Program
             nameGrpcServiceConfig,
             nameCommonResourcesConfig,
             nameServiceConfigYaml,
-            nameTransport);
+            nameTransport,
+            nameRequestNumericEnumJsonEncoding);
 
         public class Options
         {
@@ -184,7 +185,7 @@ private static int GenerateFromProtoc(Stream stdin, Stream stdout)
                 var serviceConfigPath = extraParams.GetValueOrDefault(nameServiceConfigYaml)?.SingleOrDefault();
                 var commonResourcesConfigPaths = extraParams.GetValueOrDefault(nameCommonResourcesConfig);
                 var transports = ParseTransports(extraParams.GetValueOrDefault(nameTransport)?.SingleOrDefault());
-                var requestNumericEnumJsonEncoding = extraParams.GetValueOrDefault(nameRequestNumericEnumJsonEncoding)?.SingleOrDefault() == "true";
+                var requestNumericEnumJsonEncoding = string.Equals(extraParams.GetValueOrDefault(nameRequestNumericEnumJsonEncoding)?.SingleOrDefault(), "true", StringComparison.OrdinalIgnoreCase);
 
                 var results = CodeGenerator.Generate(codeGenRequest.ProtoFile, codeGenRequest.FileToGenerate,
                     SystemClock.Instance, grpcServiceConfigPath, serviceConfigPath, commonResourcesConfigPaths, transports, requestNumericEnumJsonEncoding);
diff --git a/rules_csharp_gapic/csharp_gapic.bzl b/rules_csharp_gapic/csharp_gapic.bzl
index 97f97030..70cbaf22 100644
--- a/rules_csharp_gapic/csharp_gapic.bzl
+++ b/rules_csharp_gapic/csharp_gapic.bzl
@@ -47,22 +47,24 @@ def csharp_gapic_library(
         **kwargs):
     # Build zip file of gapic-generator output
     name_srcjar = "{name}_srcjar".format(name = name)
-    plugin_file_args = {}
+    opt_file_args = {}
+    opt_args = []
     if grpc_service_config:
-        plugin_file_args[grpc_service_config] = "grpc-service-config"
+        opt_file_args[grpc_service_config] = "grpc-service-config"
     if common_resources_config:
-        plugin_file_args[common_resources_config] = "common-resources-config"
+        opt_file_args[common_resources_config] = "common-resources-config"
     if service_yaml:
-        plugin_file_args[service_yaml] = "service-config"
+        opt_file_args[service_yaml] = "service-config"
     if rest_numeric_enums:
-        plugin_file_args[rest_numeric_enums] = "rest-numeric-enums"
+        opt_args.append("rest-numeric-enums={}".format(rest_numeric_enums))
     if transport:
-        plugin_file_args[transport] = "transport"
+        opt_args.append("transport={}".format(transport))
     proto_custom_library(
         name = name_srcjar,
         deps = srcs,
         plugin = Label(generator_binary),
-        plugin_file_args = plugin_file_args,
+        opt_file_args = opt_file_args,
+        opt_args = opt_args,
         output_type = "gapic",
         output_suffix = ".srcjar",
         **kwargs