diff --git a/props/prop_base.h b/props/prop_base.h
index d6b001300..8be8f037a 100644
--- a/props/prop_base.h
+++ b/props/prop_base.h
@@ -2,7 +2,7 @@
 #define PROPS_PROP_BASE_H
 
 // Update SPEC and sound_library_ defines before we use them.
-#include "sound/sound_library.h"
+#include "../sound/sound_library.h"
 
 #ifndef PROP_INHERIT_PREFIX
 #define PROP_INHERIT_PREFIX