diff --git a/crates/rb-sys-test-helpers/src/ruby_test_executor.rs b/crates/rb-sys-test-helpers/src/ruby_test_executor.rs
index 94de39e3..ee718bb7 100644
--- a/crates/rb-sys-test-helpers/src/ruby_test_executor.rs
+++ b/crates/rb-sys-test-helpers/src/ruby_test_executor.rs
@@ -47,13 +47,15 @@ impl RubyTestExecutor {
             timeout: Duration::from_secs(10),
         };
 
-        executor.run(|| {
-            static INIT: Once = Once::new();
+        executor
+            .run(|| {
+                static INIT: Once = Once::new();
 
-            INIT.call_once(|| unsafe {
-                setup_ruby_unguarded();
-            });
-        });
+                INIT.call_once(|| unsafe {
+                    setup_ruby_unguarded();
+                })
+            })
+            .expect("Failed to setup Ruby");
 
         executor
     }
@@ -65,7 +67,7 @@ impl RubyTestExecutor {
     pub fn shutdown(&mut self) {
         self.set_test_timeout(Duration::from_secs(3));
 
-        self.run(|| unsafe {
+        let _ = self.run(|| unsafe {
             cleanup_ruby();
         });
 
diff --git a/crates/rb-sys-tests/Cargo.toml b/crates/rb-sys-tests/Cargo.toml
index 5dd261a6..195531af 100644
--- a/crates/rb-sys-tests/Cargo.toml
+++ b/crates/rb-sys-tests/Cargo.toml
@@ -15,6 +15,7 @@ doc = false
 rb-sys = { path = "../rb-sys", features = [
   "link-ruby",
   "stable-api-compiled-testing",
+  "rb-gc-guard",
 ] }
 rb-sys-env = { path = "../rb-sys-env" }
 rb-sys-test-helpers = { path = "../rb-sys-test-helpers" }
diff --git a/crates/rb-sys/Cargo.toml b/crates/rb-sys/Cargo.toml
index f98158b6..cd081c69 100644
--- a/crates/rb-sys/Cargo.toml
+++ b/crates/rb-sys/Cargo.toml
@@ -18,6 +18,7 @@ rb-sys-build = { version = "0.9.79", path = "../rb-sys-build" }
 
 [dev-dependencies]
 rb-sys = { path = ".", features = [
+  "rb-gc-guard",
   "link-ruby",
   "stable-api-compiled-fallback",
 ] }
@@ -37,6 +38,7 @@ stable-api-compiled-testing = [
 ] # For testing the fallback in rb-sys (internal)
 stable-api-compiled-force = [] # Always use the compiled C API
 ruby-macros = ["stable-api"] # deprecated
+rb-gc-guard = [] # Needs asm features Rust 1.59+
 bindgen-rbimpls = ["rb-sys-build/bindgen-rbimpls"]
 bindgen-deprecated-types = ["rb-sys-build/bindgen-deprecated-types"]
 bindgen-layout-tests = ["rb-sys-build/bindgen-layout-tests"]
diff --git a/crates/rb-sys/src/stable_api.rs b/crates/rb-sys/src/stable_api.rs
index 045e6608..aef1dca0 100644
--- a/crates/rb-sys/src/stable_api.rs
+++ b/crates/rb-sys/src/stable_api.rs
@@ -150,7 +150,7 @@ pub const fn get_default() -> &'static api::Definition {
 
 /// Get the fallback stable API definition for the current Ruby version, which
 /// is compiled C code that is linked into to this crate.
-#[cfg(all(stable_api_enable_compiled_mod))]
+#[cfg(stable_api_enable_compiled_mod)]
 pub const fn get_compiled() -> &'static compiled::Definition {
     const COMPILED_API: compiled::Definition = compiled::Definition {};
     &COMPILED_API