diff --git a/driver/level3/level3_syrk_threaded.c b/driver/level3/level3_syrk_threaded.c
index 574f825b0..a041abac3 100644
--- a/driver/level3/level3_syrk_threaded.c
+++ b/driver/level3/level3_syrk_threaded.c
@@ -67,7 +67,7 @@
 #endif
 
 typedef struct {
-#if __STDC_VERSION__ >= 201112L
+#ifdef HAVE_C11
 _Atomic
 #else 
   volatile