diff --git a/crypto/internal.h b/crypto/internal.h
index 62ce4a3271..8e6aee9f44 100644
--- a/crypto/internal.h
+++ b/crypto/internal.h
@@ -580,7 +580,8 @@ OPENSSL_EXPORT void CRYPTO_once(CRYPTO_once_t *once, void (*init)(void));
 
 // Reference counting.
 
-#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
+#if !defined(__STDC_NO_ATOMICS__) && defined(__STDC_VERSION__) && \
+    __STDC_VERSION__ >= 201112L
 #include <stdatomic.h>
 // CRYPTO_refcount_t is a |uint32_t|
 #define AWS_LC_ATOMIC_LOCK_FREE ATOMIC_LONG_LOCK_FREE
@@ -589,9 +590,8 @@ OPENSSL_EXPORT void CRYPTO_once(CRYPTO_once_t *once, void (*init)(void));
 #endif
 
 // Automatically enable C11 atomics if implemented and lock free
-#if !defined(OPENSSL_C11_ATOMIC) && defined(OPENSSL_THREADS) &&   \
-    !defined(__STDC_NO_ATOMICS__) && defined(__STDC_VERSION__) && \
-    __STDC_VERSION__ >= 201112L && AWS_LC_ATOMIC_LOCK_FREE == 2
+#if !defined(OPENSSL_C11_ATOMIC) && defined(OPENSSL_THREADS) && \
+    AWS_LC_ATOMIC_LOCK_FREE == 2
 #define OPENSSL_C11_ATOMIC
 #endif