diff --git a/panda/src/pgraph/sceneGraphAnalyzer.h b/panda/src/pgraph/sceneGraphAnalyzer.h
index 29114e9c82..29de6635f6 100644
--- a/panda/src/pgraph/sceneGraphAnalyzer.h
+++ b/panda/src/pgraph/sceneGraphAnalyzer.h
@@ -31,6 +31,7 @@ class PandaNode;
 class GeomNode;
 class Geom;
 class GeomVertexData;
+class GeomVertexFormat;
 class GeomVertexArrayData;
 class Texture;