diff --git a/stepmania/src/arch/MovieTexture/MovieTexture_DShow.h b/stepmania/src/arch/MovieTexture/MovieTexture_DShow.h
index 990d1914bc..63e79210be 100644
--- a/stepmania/src/arch/MovieTexture/MovieTexture_DShow.h
+++ b/stepmania/src/arch/MovieTexture/MovieTexture_DShow.h
@@ -37,6 +37,7 @@ typedef char TCHAR, *PTCHAR;
 #include "RageTexture.h"
 #include "RageThreads.h"
 
+#include "SDL_mutex.h"
 
 //-----------------------------------------------------------------------------
 // RageMovieTexture Class Declarations