diff --git a/src/Editors/_EditChildRef.py b/src/Editors/_EditChildRef.py
index 9a93a9bb4..a3ed39eef 100644
--- a/src/Editors/_EditChildRef.py
+++ b/src/Editors/_EditChildRef.py
@@ -62,7 +62,7 @@ from BasicUtils import name_displayer
 
 _RETURN = gtk.gdk.keyval_from_name("Return")
 _KP_ENTER = gtk.gdk.keyval_from_name("KP_Enter")
-_LEFT_BUTTOGN = 1
+_LEFT_BUTTON = 1
 _RIGHT_BUTTON = 3
 
 #-------------------------------------------------------------------------