diff --git a/xmloff/source/forms/elementimport.cxx b/xmloff/source/forms/elementimport.cxx
index d0df9c2b604d..e234ce5cf132 100644
--- a/xmloff/source/forms/elementimport.cxx
+++ b/xmloff/source/forms/elementimport.cxx
@@ -889,7 +889,7 @@ namespace xmloff
             SAL_WARN_IF(
                     _rPropValue.Name == PROPERTY_EFFECTIVE_VALUE
                 ||  _rPropValue.Name == PROPERTY_EFFECTIVE_DEFAULT, "xmloff",
-                "OControlImport::implTranslateValueProperty: invalid property type/name combination, Any and " + _rPropValue.Name);
+                "OControlImport::implTranslateValueProperty: invalid property type/name combination, Any and " << _rPropValue.Name);
 
             // Both properties are allowed to have a double or a string value,
             // so first try to convert the string into a number