diff --git a/library/compiler-builtins/libm/test-generator/src/main.rs b/library/compiler-builtins/libm/test-generator/src/main.rs
index 6353b257dce3..40eac207c153 100644
--- a/library/compiler-builtins/libm/test-generator/src/main.rs
+++ b/library/compiler-builtins/libm/test-generator/src/main.rs
@@ -567,7 +567,7 @@ f32_f32! {
     // atanf,
     // cbrtf,
     // ceilf,
-    // cosf,
+    cosf,
     // coshf,
     // exp2f,
     expf,