diff --git a/include/grpc/impl/codegen/port_platform.h b/include/grpc/impl/codegen/port_platform.h
index bac409e514d188ae6e6c43d4e9c799bd0f972324..a828f6c188f70f7738f542d088eaf2184b2feffc 100644
--- a/include/grpc/impl/codegen/port_platform.h
+++ b/include/grpc/impl/codegen/port_platform.h
@@ -293,8 +293,8 @@
 #if defined(__has_include)
 #if __has_include(<atomic>)
 #define GRPC_HAS_CXX11_ATOMIC
-#endif  // __has_include(<atomic>)
-#endif  // defined(__has_include)
+#endif  /* __has_include(<atomic>) */
+#endif  /* defined(__has_include) */
 
 #ifndef GPR_PLATFORM_STRING
 #warning "GPR_PLATFORM_STRING not auto-detected"