diff --git a/panda/src/framework/windowFramework.cxx b/panda/src/framework/windowFramework.cxx
index b208935cdd..a551070a01 100644
--- a/panda/src/framework/windowFramework.cxx
+++ b/panda/src/framework/windowFramework.cxx
@@ -153,7 +153,7 @@ close_window() {
   _one_sided_reverse_enabled = false;
   _lighting_enabled = false;
 
-  _frame_rate_meter == (FrameRateMeter *)NULL;
+  _frame_rate_meter = (FrameRateMeter *)NULL;
 }
 
 ////////////////////////////////////////////////////////////////////