diff --git a/include/wx/mac/carbon/dataform.h b/include/wx/mac/carbon/dataform.h
index 43dbd7bffb..6de68218ad 100644
--- a/include/wx/mac/carbon/dataform.h
+++ b/include/wx/mac/carbon/dataform.h
@@ -53,7 +53,8 @@ public:
     void SetType( wxDataFormatId type );
 
     // returns true if the format is one of those defined in wxDataFormatId
-    bool IsStandard() const { return m_format > 0 && m_format < wxDF_PRIVATE; }
+    bool IsStandard() const { return m_type > 0 && m_type < wxDF_PRIVATE; }
+    
 private:
     wxDataFormatId   m_type;
     NativeFormat     m_format;