diff --git a/stepmania/src/arch/Sound/RageSoundDriver_Null.h b/stepmania/src/arch/Sound/RageSoundDriver_Null.h
index 0aefb84657..38aeb9a700 100644
--- a/stepmania/src/arch/Sound/RageSoundDriver_Null.h
+++ b/stepmania/src/arch/Sound/RageSoundDriver_Null.h
@@ -14,6 +14,7 @@
 
 #include "RageSound.h"
 #include <time.h>
+#include "RageSoundDriver.h"
 
 class RageSound_Null: public RageSoundDriver
 {