--- a/tests/PPArithmeticParser.st	Mon Apr 13 14:19:55 2015 +0100
+++ b/tests/PPArithmeticParser.st	Mon Apr 13 22:00:44 2015 +0100
@@ -1,5 +1,7 @@
 "{ Package: 'stx:goodies/petitparser/tests' }"
 
+"{ NameSpace: Smalltalk }"
+
 PPCompositeParser subclass:#PPArithmeticParser
 	instanceVariableNames:'terms addition factors multiplication power primary parentheses
 		number'
@@ -38,7 +40,7 @@
 
 parentheses
 	^ $( asParser trim , terms , $) asParser trim
-		==> [ :nodes | nodes second ]
+		==> [ :nodes | nodes at: 2 ]
 !
 
 power