diff --git a/lib/galaxy/tools/wrappers.py b/lib/galaxy/tools/wrappers.py
index 196f1845d72..0acf136163a 100644
--- a/lib/galaxy/tools/wrappers.py
+++ b/lib/galaxy/tools/wrappers.py
@@ -81,6 +81,9 @@ class InputValueWrapper( ToolParameterValueWrapper ):
         else:
             return super( InputValueWrapper, self ) == other
 
+    def __ne__( self, other ):
+        return not self == other
+
     def __str__( self ):
         to_param_dict_string = self.input.to_param_dict_string( self.value, self._other_values )
         if isinstance( to_param_dict_string, list ):
@@ -146,6 +149,9 @@ class SelectToolParameterWrapper( ToolParameterValueWrapper ):
         else:
             return super( SelectToolParameterWrapper, self ) == other
 
+    def __ne__( self, other ):
+        return not self == other
+
     def __str__( self ):
         # Assuming value is never a path - otherwise would need to pass
         # along following argument value_map=self._path_rewriter.