diff --git a/public/datacache/iprecachesystem.h b/public/datacache/iprecachesystem.h
index 41d49150..d9b89355 100644
--- a/public/datacache/iprecachesystem.h
+++ b/public/datacache/iprecachesystem.h
@@ -17,7 +17,7 @@
 #include "tier0/dbg.h"
 #include "tier2/tier2.h"
 #include "tier2/resourceprecacher.h"
-#include "appframework/iappsystem.h"
+#include "appframework/IAppSystem.h"
 
 //-----------------------------------------------------------------------------
 // Resource access control API