diff --git a/vphysics_jolt/cbase.h b/vphysics_jolt/cbase.h
index 656b7df..5e5ef88 100644
--- a/vphysics_jolt/cbase.h
+++ b/vphysics_jolt/cbase.h
@@ -41,7 +41,11 @@
 #include "tier1/tier1.h"
 #include "tier1/strtools.h"
 #include "tier1/interface.h"
+#ifndef GAME_L4D2_OR_NEWER
 #include "tier1/KeyValues.h"
+#else
+#include "tier1/keyvalues.h"
+#endif
 #include "tier1/UtlStringMap.h"
 #include "tier1/utlbuffer.h"