diff --git a/aegisub/src/stdwx.h b/aegisub/src/stdwx.h
index 623ce3e24..32a2772e6 100644
--- a/aegisub/src/stdwx.h
+++ b/aegisub/src/stdwx.h
@@ -47,6 +47,11 @@
 
 /////////
 // Setup
+#ifdef _CRT_SECURE_NO_WARNINGS
+#define _CRT_SECURE_NO_WARNINGS_DEFINED
+#else
+#define _CRT_SECURE_NO_WARNINGS
+#endif
 #define WIN32_LEAN_AND_MEAN
 #define WX_PRE
 
@@ -175,4 +180,8 @@
 #include <GL/glu.h>
 #endif
 
+#ifndef _CRT_SECURE_NO_WARNINGS
+#undef _CRT_SECURE_NO_WARNINGS
+#endif
+
 #endif // C++