diff --git a/github.js b/github.js
index e45e5d50..69825395 100644
--- a/github.js
+++ b/github.js
@@ -574,6 +574,7 @@
           };
           delPath += "?message=" + encodeURIComponent(params.message);
           delPath += "&sha=" + encodeURIComponent(params.sha);
+          delPath += '&branch=' + encodeURIComponent(branch);
           _request("DELETE", delPath, null, cb);
         });
       };