diff --git a/src/main.rs b/src/main.rs
index 7d20d0e9f5bc929e13b227ae5aca750f807788f4..c60599daf916c5211b808b223413916f460fffb8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -310,7 +310,7 @@ fn series(out: &mut Output, repo: &Repository) -> Result<()> {
         }
     }
     let shead_target = if let Some(shead) = try!(notfound_to_none(repo.find_reference(SHEAD_REF))) {
-        Some(try!(shead_series_name(&shead)).to_string())
+        Some(try!(shead_series_name(&shead)))
     } else {
         None
     };