Index: include/XPath/impl/xpath_logical.hpp
--- include/XPath/impl/xpath_logical.hpp.orig
+++ include/XPath/impl/xpath_logical.hpp
@@ -23,7 +23,7 @@ class LogicalOperator : public BinaryExpression<string
   virtual XPathValue<string_type, string_adaptor> evaluate(const DOM::Node<string_type, string_adaptor>& context, 
                                                            const ExecutionContext<string_type, string_adaptor>& executionContext) const 
   {
-    return BoolValue<string_type, string_adaptor>::createValue(evaluateAsBool(context, executionContext));
+    return BoolValue<string_type, string_adaptor>::createValue(this->evaluateAsBool(context, executionContext));
   } // evaluate
 }; // class LogicalOperator
 
