diff --git a/panda/src/cocoadisplay/cocoaGraphicsWindow.mm b/panda/src/cocoadisplay/cocoaGraphicsWindow.mm
index 84a5d9149a..bcc859f1a8 100644
--- a/panda/src/cocoadisplay/cocoaGraphicsWindow.mm
+++ b/panda/src/cocoadisplay/cocoaGraphicsWindow.mm
@@ -182,7 +182,7 @@ begin_frame(FrameMode mode, Thread *current_thread) {
 
   // Lock the view for drawing.
   if (!_properties.get_fullscreen()) {
-    nassertr([_view lockFocusIfCanDraw], false);
+    nassertr_always([_view lockFocusIfCanDraw], false);
   }
 
   // Make the context current.