diff --git a/reactos/include/crt/math.h b/reactos/include/crt/math.h
index 94c0d6541c3..83a1ea2e1f9 100644
--- a/reactos/include/crt/math.h
+++ b/reactos/include/crt/math.h
@@ -6,7 +6,7 @@
 #ifndef _INC_MATH
 #define _INC_MATH
 
-#include <crtdefs.h>
+#include "crtdefs.h"
 
 struct exception;