diff --git a/panda/src/pgraph/loader.cxx b/panda/src/pgraph/loader.cxx
index abf569be7f..626d900546 100644
--- a/panda/src/pgraph/loader.cxx
+++ b/panda/src/pgraph/loader.cxx
@@ -22,6 +22,7 @@
 #include "config_pgraph.h"
 
 #include "config_express.h"
+#include "config_util.h"
 #include "virtualFileSystem.h"
 #include "event.h"
 #include "pt_Event.h"