diff --git a/source/games/duke/src/duke3d.h b/source/games/duke/src/duke3d.h
index 9592ccd7c..7716cc921 100644
--- a/source/games/duke/src/duke3d.h
+++ b/source/games/duke/src/duke3d.h
@@ -114,7 +114,7 @@ END_DUKE_NS
 #include "game.h"
 #include "gamedef.h"
 #include "gameexec.h"
-#include "gamevars.h"
+#include "gamevar.h"
 #include "global.h"
 #include "inv.h"
 #include "macros.h"