diff --git a/lib/isc/include/isc/atomic.h b/lib/isc/include/isc/atomic.h
index 5edb0957f0..5a415bc15d 100644
--- a/lib/isc/include/isc/atomic.h
+++ b/lib/isc/include/isc/atomic.h
@@ -13,7 +13,7 @@
 
 #pragma once
 
-#if __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_ATOMICS__)
+#if HAVE_STDATOMIC_H
 #include <stdatomic.h>
 #else
 #include <isc/stdatomic.h>