diff --git a/src/backends/github/API.js b/src/backends/github/API.js
index 7bddd27e5c42..407d8133f4fb 100644
--- a/src/backends/github/API.js
+++ b/src/backends/github/API.js
@@ -225,6 +225,7 @@ export default class API {
         params: {
           head: branchName,
           state: 'open',
+          base: this.branch,
         },
       })
         .then(prs => prs.some(pr => pr.head.ref === branchName));