diff --git a/libc/include/bits/stdatomic.h b/libc/include/bits/stdatomic.h
index bd94b2d..8df86e2 100644
--- a/libc/include/bits/stdatomic.h
+++ b/libc/include/bits/stdatomic.h
@@ -138,11 +138,11 @@
  * 7.17.4 Fences.
  */
 
-static inline void atomic_thread_fence(memory_order __order __attribute__((unused))) {
+static inline void atomic_thread_fence(memory_order __order __attribute__((__unused__))) {
 	__c11_atomic_thread_fence(__order);
 }
 
-static inline void atomic_signal_fence(memory_order __order __attribute__((unused))) {
+static inline void atomic_signal_fence(memory_order __order __attribute__((__unused__))) {
 	__c11_atomic_signal_fence(__order);
 }