diff --git a/lib/platform/github/index.js b/lib/platform/github/index.js
index b23555415ca6a53f1ca0f58a328d0af61f19c0ba..19594b26108f52b82206b7bef61083038bd23b5d 100644
--- a/lib/platform/github/index.js
+++ b/lib/platform/github/index.js
@@ -39,7 +39,6 @@ module.exports = {
   findPr,
   createPr,
   getPr,
-  getPrFiles,
   updatePr,
   mergePr,
   // file
@@ -831,18 +830,6 @@ async function getPr(prNo) {
   return pr;
 }
 
-// Return a list of all modified files in a PR
-async function getPrFiles(prNo) {
-  logger.debug({ prNo }, 'getPrFiles');
-  if (!prNo) {
-    return [];
-  }
-  const files = (await get(
-    `repos/${config.parentRepo || config.repository}/pulls/${prNo}/files`
-  )).body;
-  return files.map(f => f.filename);
-}
-
 async function updatePr(prNo, title, body) {
   logger.debug(`updatePr(${prNo}, ${title}, body)`);
   const patchBody = { title };
diff --git a/lib/platform/gitlab/index.js b/lib/platform/gitlab/index.js
index 939579d02206b7d8e986486ce048cba1de4cbf0e..52d69e2ff24842e9a2f88683c9e8322bd1654b2c 100644
--- a/lib/platform/gitlab/index.js
+++ b/lib/platform/gitlab/index.js
@@ -34,7 +34,6 @@ module.exports = {
   findPr,
   createPr,
   getPr,
-  getPrFiles,
   updatePr,
   mergePr,
   // file
@@ -482,11 +481,6 @@ async function getPr(iid) {
   return pr;
 }
 
-function getPrFiles() {
-  // TODO
-  return [];
-}
-
 async function updatePr(iid, title, description) {
   await get.put(`projects/${config.repository}/merge_requests/${iid}`, {
     body: {
diff --git a/lib/platform/vsts/index.js b/lib/platform/vsts/index.js
index b16f5656d2c08f0a87d721977a4712587c138a92..7fd084193157a1e3d0b507299c41950e4dd95c02 100644
--- a/lib/platform/vsts/index.js
+++ b/lib/platform/vsts/index.js
@@ -36,7 +36,6 @@ module.exports = {
   findPr,
   createPr,
   getPr,
-  getPrFiles,
   updatePr,
   mergePr,
   // file
@@ -557,9 +556,3 @@ async function addReviewers(prNo, reviewers) {
     })
   );
 }
-
-// to become async?
-function getPrFiles(prNo) {
-  logger.info(`getPrFiles(prNo)(${prNo}) - Not supported by VSTS (yet!)`);
-  return [];
-}
diff --git a/test/platform/__snapshots__/index.spec.js.snap b/test/platform/__snapshots__/index.spec.js.snap
index 0543b2fb6e3ccfd68643a64e0609a65c41e530b9..13901bdef4d8a93ded572d0cf77bfe58eeb99f11 100644
--- a/test/platform/__snapshots__/index.spec.js.snap
+++ b/test/platform/__snapshots__/index.spec.js.snap
@@ -27,7 +27,6 @@ Array [
   "findPr",
   "createPr",
   "getPr",
-  "getPrFiles",
   "updatePr",
   "mergePr",
   "commitFilesToBranch",
@@ -63,7 +62,6 @@ Array [
   "findPr",
   "createPr",
   "getPr",
-  "getPrFiles",
   "updatePr",
   "mergePr",
   "commitFilesToBranch",
@@ -99,7 +97,6 @@ Array [
   "findPr",
   "createPr",
   "getPr",
-  "getPrFiles",
   "updatePr",
   "mergePr",
   "commitFilesToBranch",
diff --git a/test/platform/github/__snapshots__/index.spec.js.snap b/test/platform/github/__snapshots__/index.spec.js.snap
index 91fdb424155c2a47c499176150d46a36367fb35f..19a04807f6ad6fb736ab11461b31c2790e98837b 100644
--- a/test/platform/github/__snapshots__/index.spec.js.snap
+++ b/test/platform/github/__snapshots__/index.spec.js.snap
@@ -523,13 +523,6 @@ Object {
 }
 `;
 
-exports[`platform/github getPrFiles() returns files 1`] = `
-Array [
-  "renovate.json",
-  "not renovate.json",
-]
-`;
-
 exports[`platform/github getRepos should return an array of repos 1`] = `
 Array [
   Array [
diff --git a/test/platform/github/index.spec.js b/test/platform/github/index.spec.js
index 7b840d9568c82a78a55915c4f5cf51401cda6950..6a49737c84cccded5c2fd99cb0066ac359904933 100644
--- a/test/platform/github/index.spec.js
+++ b/test/platform/github/index.spec.js
@@ -1309,23 +1309,6 @@ describe('platform/github', () => {
       expect(pr).toMatchSnapshot();
     });
   });
-  describe('getPrFiles()', () => {
-    it('should return empty if no prNo is passed', async () => {
-      const prFiles = await github.getPrFiles(null);
-      expect(prFiles).toEqual([]);
-    });
-    it('returns files', async () => {
-      get.mockReturnValueOnce({
-        body: [
-          { filename: 'renovate.json' },
-          { filename: 'not renovate.json' },
-        ],
-      });
-      const prFiles = await github.getPrFiles(123);
-      expect(prFiles).toMatchSnapshot();
-      expect(prFiles).toHaveLength(2);
-    });
-  });
   describe('updatePr(prNo, title, body)', () => {
     it('should update the PR', async () => {
       await initRepo({ repository: 'some/repo', token: 'token' });
diff --git a/test/platform/gitlab/index.spec.js b/test/platform/gitlab/index.spec.js
index 94bca4325e71073dbe01e1b5c2b297a15ff3eb26..cfc9d94cf91945c1d6ef5d46f3526ada3e035f80 100644
--- a/test/platform/gitlab/index.spec.js
+++ b/test/platform/gitlab/index.spec.js
@@ -610,12 +610,6 @@ describe('platform/gitlab', () => {
       expect(pr).toMatchSnapshot();
     });
   });
-  describe('getPrFiles()', () => {
-    it('should return empty', async () => {
-      const prFiles = await gitlab.getPrFiles();
-      expect(prFiles).toEqual([]);
-    });
-  });
   describe('updatePr(prNo, title, body)', () => {
     jest.resetAllMocks();
     it('updates the PR', async () => {
diff --git a/test/platform/vsts/index.spec.js b/test/platform/vsts/index.spec.js
index eb0a81f047f550554a793ba36b2edc16dc0bb1a7..381ca7d157034d2955e0dbf93da402b1e917fa70 100644
--- a/test/platform/vsts/index.spec.js
+++ b/test/platform/vsts/index.spec.js
@@ -691,11 +691,5 @@ describe('platform/vsts', () => {
       const res = await vsts.mergePr();
       expect(res).toBeUndefined();
     });
-
-    // to become async?
-    it('getPrFiles', () => {
-      const res = vsts.getPrFiles(46);
-      expect(res.length).toBe(0);
-    });
   });
 });