--- a/AbstractSettingsApplication.st	Tue May 31 20:22:38 2016 +0200
+++ b/AbstractSettingsApplication.st	Wed Jun 01 12:49:27 2016 +0200
@@ -6524,7 +6524,7 @@
     function := self selectedFunctionKey value asSymbol.
 
     function = (resources string:'* unassigned *') ifTrue:[
-        mappings removekey:rawKey
+        mappings removeKey:rawKey
     ] ifFalse:[
         mappings at:rawKey put:function.
     ].