diff --git a/ev_vec.h b/ev_vec.h
index 376fcde..8c20ff8 100644
--- a/ev_vec.h
+++ b/ev_vec.h
@@ -6,7 +6,7 @@
 #include "ev_types.h"
 #include "ev_numeric.h"
 
-#if !EV_OS_WINDOWS
+#if !EV_CC_MSVC
 #include <string.h>
 #endif