diff --git a/src/parse/mod.rs b/src/parse/mod.rs
index 81f04c6..e49fe36 100644
--- a/src/parse/mod.rs
+++ b/src/parse/mod.rs
@@ -67,7 +67,7 @@ pub fn Quoted_string(input: &[u8]) -> IResult<&[u8], Cow<'_, str>> {
             map_res(recognize(many0(QcontentSMTP)), std::str::from_utf8),
             DQUOTE,
         ),
-        |s| unescape_quoted(s),
+        unescape_quoted,
     )(input)
 }