diff --git a/include/wx/mac/carbon/dataform.h b/include/wx/mac/carbon/dataform.h
index 6de68218ad..ffc4f87a42 100644
--- a/include/wx/mac/carbon/dataform.h
+++ b/include/wx/mac/carbon/dataform.h
@@ -29,7 +29,7 @@ public:
     // comparison (must have both versions)
     bool operator==(const wxDataFormat& format) const ;
     bool operator!=(const wxDataFormat& format) const
-        { return ! ( *this != format ); }
+        { return ! ( *this == format ); }
     bool operator==(wxDataFormatId format) const
         { return m_type == (wxDataFormatId)format; }
     bool operator!=(wxDataFormatId format) const
@@ -54,7 +54,7 @@ public:
 
     // returns true if the format is one of those defined in wxDataFormatId
     bool IsStandard() const { return m_type > 0 && m_type < wxDF_PRIVATE; }
-    
+
 private:
     wxDataFormatId   m_type;
     NativeFormat     m_format;