diff --git a/lapack/getrf/potrf_parallel.c b/lapack/getrf/potrf_parallel.c
index 312509685..008fcb8cc 100644
--- a/lapack/getrf/potrf_parallel.c
+++ b/lapack/getrf/potrf_parallel.c
@@ -101,7 +101,7 @@ static FLOAT dm1 = -1.;
 #endif
 
 typedef struct {
-#if __STDC_VERSION__ >= 201112L
+#ifdef HAVE_C11
   _Atomic 
 #else
   volatile