diff --git a/src/g_hub.h b/src/g_hub.h
index bc7c89df3..855402de7 100644
--- a/src/g_hub.h
+++ b/src/g_hub.h
@@ -4,6 +4,7 @@
 struct cluster_info_t;
 struct wbstartstruct_t;
 class FSerializer;
+struct FLevelLocals;
 
 void G_SerializeHub (FSerializer &file);
 void G_LeavingHub(FLevelLocals *Level, int mode, cluster_info_t * cluster, struct wbstartstruct_t * wbs);