diff --git a/src/sdl/load_libraries.c b/src/sdl/load_libraries.c
index bfc1d60fd2a1f6cccf862a8a1a5aa6349704d9d8..904a73c11e03ae127eca41b042a28139d99ac122 100644
--- a/src/sdl/load_libraries.c
+++ b/src/sdl/load_libraries.c
@@ -2,6 +2,8 @@
 /// Dynamic Library Loading
 ///
 
+#include "../doomdef.h"
+
 #ifdef _MSC_VER
 #pragma warning(disable : 4214 4244)
 #endif