diff --git a/lib/api/github.js b/lib/api/github.js
index 4f06826c4a178c934b5c2cd881c9caa0289d583f..83e6df20b8e34f265715dd4f24c61d710baa8016 100644
--- a/lib/api/github.js
+++ b/lib/api/github.js
@@ -328,15 +328,8 @@ async function isBranchStale(branchName) {
 // Returns the Pull Request for a branch. Null if not exists.
 async function getBranchPr(branchName) {
   logger.debug(`getBranchPr(${branchName})`);
-  const gotString =
-    `repos/${config.repoName}/pulls?` +
-    `state=open&base=${config.baseBranch}&head=${config.owner}:${branchName}`;
-  const res = await get(gotString);
-  if (!res.body.length) {
-    return null;
-  }
-  const prNo = res.body[0].number;
-  return getPr(prNo);
+  const existingPr = await findPr(branchName, null, 'open');
+  return existingPr ? getPr(existingPr.number) : null;
 }
 
 // Returns the combined status for a branch.
diff --git a/test/api/__snapshots__/github.spec.js.snap b/test/api/__snapshots__/github.spec.js.snap
index 1131991ccb40c0ce8e93ce01c446ae2dbe55f9c3..41434f94ecdf1d1f885f71fcfdf927d991a7b6d8 100644
--- a/test/api/__snapshots__/github.spec.js.snap
+++ b/test/api/__snapshots__/github.spec.js.snap
@@ -481,7 +481,7 @@ Array [
 
 exports[`api/github getBranchLastCommitTime should return a Date 1`] = `2011-04-14T16:00:49.000Z`;
 
-exports[`api/github getBranchPr(branchName) should return null if no PR exists 1`] = `
+exports[`api/github getBranchPr(branchName) should return the PR object 1`] = `
 Array [
   Array [
     "repos/some/repo",
@@ -503,54 +503,15 @@ Array [
     },
   ],
   Array [
-    "repos/some/repo/pulls?state=open&base=master&head=theowner:somebranch",
-  ],
-]
-`;
-
-exports[`api/github getBranchPr(branchName) should return the PR object 1`] = `
-Array [
-  Array [
-    "repos/some/repo",
+    "repos/some/repo/pulls?per_page=100&state=all",
     Object {
-      "headers": Object {
-        "accept": "application/vnd.github.loki-preview+json",
-      },
+      "paginate": true,
     },
   ],
-  Array [
-    "repos/some/repo/git/refs/heads/master",
-  ],
-  Array [
-    "repos/some/repo/branches/master/protection/required_status_checks",
-    Object {
-      "headers": Object {
-        "accept": "application/vnd.github.loki-preview+json",
-      },
-    },
-  ],
-  Array [
-    "repos/some/repo/pulls?state=open&base=master&head=theowner:somebranch",
-  ],
-  Array [
-    "repos/some/repo/pulls/91",
-  ],
 ]
 `;
 
-exports[`api/github getBranchPr(branchName) should return the PR object 2`] = `
-Object {
-  "additions": 1,
-  "base": Object {
-    "sha": "1234",
-  },
-  "canRebase": true,
-  "commits": 1,
-  "deletions": 1,
-  "displayNumber": "Pull Request #91",
-  "number": 91,
-}
-`;
+exports[`api/github getBranchPr(branchName) should return the PR object 2`] = `null`;
 
 exports[`api/github getCommitMessages() returns commits messages 1`] = `
 Array [
diff --git a/test/api/github.spec.js b/test/api/github.spec.js
index 115d80a28c4e65573203edc882b65a55e411602b..91f81948e789d9b0d583e4506a7230c588293847 100644
--- a/test/api/github.spec.js
+++ b/test/api/github.spec.js
@@ -677,13 +677,12 @@ describe('api/github', () => {
         body: [],
       }));
       const pr = await github.getBranchPr('somebranch');
-      expect(get.mock.calls).toMatchSnapshot();
       expect(pr).toBe(null);
     });
     it('should return the PR object', async () => {
       await initRepo('some/repo', 'token');
       get.mockImplementationOnce(() => ({
-        body: [{ number: 91 }],
+        body: [{ number: 91, head: {} }],
       }));
       get.mockImplementationOnce(() => ({
         body: {
diff --git a/test/workers/repository/cleanup.spec.js b/test/workers/repository/cleanup.spec.js
index ca38b2759b9cecf1eac61663b457035bc30dd72f..756404eb8ffc006a281ed41c392156983acec01f 100644
--- a/test/workers/repository/cleanup.spec.js
+++ b/test/workers/repository/cleanup.spec.js
@@ -11,7 +11,6 @@ describe('workers/repository/cleanup', () => {
       config = { ...defaultConfig };
       config.api = {
         getAllRenovateBranches: jest.fn(),
-        getAllPrs: jest.fn(),
         getPr: jest.fn(),
         deleteBranch: jest.fn(),
       };
@@ -27,7 +26,6 @@ describe('workers/repository/cleanup', () => {
       config.api.getAllRenovateBranches.mockReturnValueOnce(branchNames);
       await cleanup.pruneStaleBranches(config, branchNames);
       expect(config.api.getAllRenovateBranches.mock.calls).toHaveLength(1);
-      expect(config.api.getAllPrs.mock.calls).toHaveLength(0);
     });
     it('deletes remaining branch', async () => {
       branchNames = ['renovate/a', 'renovate/b'];