diff --git a/tests/server.rs b/tests/server.rs
index 1bb29150..2e6c8706 100644
--- a/tests/server.rs
+++ b/tests/server.rs
@@ -416,7 +416,7 @@ mod response_body_lengths {
                 })
                 .map(|_| ())
                 .map_err(|_e| ())
-        }));
+        })).unwrap();
     }
 }