diff --git a/decoder/decoder.go b/decoder/decoder.go
index 29c5843..b34c93a 100644
--- a/decoder/decoder.go
+++ b/decoder/decoder.go
@@ -558,5 +558,4 @@ func convertStringValue(defVal string, vField reflect.Value) (interface{}, error
 		}
 		return defVal, nil
 	}
-	return "", NewErrTypeNotSupported(vField)
 }