diff --git a/src/libsodium/randombytes/internal/randombytes_internal_random.c b/src/libsodium/randombytes/internal/randombytes_internal_random.c
index 5cee984f..cd9681c9 100644
--- a/src/libsodium/randombytes/internal/randombytes_internal_random.c
+++ b/src/libsodium/randombytes/internal/randombytes_internal_random.c
@@ -96,13 +96,13 @@ BOOLEAN NTAPI RtlGenRandom(PVOID RandomBuffer, ULONG RandomBufferLength);
 # endif
 #endif
 
+#if !defined(TLS) && !defined(__STDC_NO_THREADS__) && \
+    defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
+# define TLS _Thread_local
+#endif
 #ifndef TLS
 # ifdef _WIN32
-#  if (defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L)
-#   define TLS _Thread_local
-#  else
-#   define TLS __declspec(thread)
-#  endif
+#  define TLS __declspec(thread)
 # else
 #  define TLS
 # endif