diff --git a/panda/src/pgraph/cullBin.cxx b/panda/src/pgraph/cullBin.cxx
index b081b05a11..c60205ed48 100644
--- a/panda/src/pgraph/cullBin.cxx
+++ b/panda/src/pgraph/cullBin.cxx
@@ -132,8 +132,8 @@ check_flash_color() {
 ////////////////////////////////////////////////////////////////////
 CullBin::ResultGraphBuilder::
 ResultGraphBuilder(PandaNode *root_node) :
-  _root_node(root_node),
-  _object_index(0)
+  _object_index(0),
+  _root_node(root_node)
 {
 }