--- a/Parser.st	Wed Nov 02 20:22:45 2016 +0100
+++ b/Parser.st	Wed Nov 02 20:27:07 2016 +0100
@@ -4789,7 +4789,7 @@
                     checkAction:[:e |
                         e problemMethod notNil
                         and:[(e problemMethod usedGlobals includes:aName)
-                        and:[(Smalltalk includesKey:aName) not]] ].
+                        and:[(Smalltalk includesKey:aName asSymbol) not]] ].
             ].
         ].
     ].