diff --git a/panda/src/pgraphnodes/shaderGenerator.h b/panda/src/pgraphnodes/shaderGenerator.h
index 02eb8a3140..1b61e8f8e8 100644
--- a/panda/src/pgraphnodes/shaderGenerator.h
+++ b/panda/src/pgraphnodes/shaderGenerator.h
@@ -124,6 +124,7 @@ protected:
   bool _calc_primary_alpha;
   bool _subsume_alpha_test;
   bool _disable_alpha_write;
+  int _num_clip_planes;
   
   bool _need_material_props;