diff --git a/direct/src/leveleditor/LevelEditorUIBase.py b/direct/src/leveleditor/LevelEditorUIBase.py
index a9a9a271cc..05c8cc9b0d 100755
--- a/direct/src/leveleditor/LevelEditorUIBase.py
+++ b/direct/src/leveleditor/LevelEditorUIBase.py
@@ -458,9 +458,11 @@ class GridSizeUI(wx.Dialog):
         vbox.Add(okButton, 1, wx.ALIGN_CENTER | wx.TOP | wx.BOTTOM, 5)
 
         self.SetSizer(vbox)
+        base.le.ui.bindKeyEvents(False)
 
     def onApply(self, evt):
         newSize = self.gridSizeSlider.GetValue()
         newSpacing = self.gridSpacingSlider.GetValue()
         self.parent.updateGrids(newSize, newSpacing)
+        base.le.ui.bindKeyEvents(True)
         self.Destroy()