diff --git a/contrib/buildbot/phabricator_wrapper.py b/contrib/buildbot/phabricator_wrapper.py
--- a/contrib/buildbot/phabricator_wrapper.py
+++ b/contrib/buildbot/phabricator_wrapper.py
@@ -366,6 +366,10 @@
 
         return commit_data[0]["fields"]["identifier"]
 
+    def get_revision_changed_files(self, revision_id):
+        return list(self.differential.getcommitpaths(
+            revision_id=revision_id).values())
+
     def get_file_content_from_master(self, path):
         latest_commit_hash = self.get_latest_master_commit_hash()
 
diff --git a/contrib/buildbot/test/mocks/phabricator.py b/contrib/buildbot/test/mocks/phabricator.py
--- a/contrib/buildbot/test/mocks/phabricator.py
+++ b/contrib/buildbot/test/mocks/phabricator.py
@@ -36,6 +36,7 @@
     phab.differential.diff.search.return_value = Result([])
     phab.differential.revision.return_value = Result([])
     phab.differential.revision.search.return_value = Result([])
+    phab.differential.getcommitpaths.return_value = {}
 
     phab.diffusion = mock.Mock()
     phab.diffusion.commit = mock.Mock()
diff --git a/contrib/buildbot/test/test_phabricator.py b/contrib/buildbot/test/test_phabricator.py
--- a/contrib/buildbot/test/test_phabricator.py
+++ b/contrib/buildbot/test/test_phabricator.py
@@ -245,6 +245,18 @@
             commit_hash,
             "0000000000000000000000000000000123456789")
 
+    def test_get_revision_changed_files(self):
+        self.phab.differential.getcommitpaths.return_value = {
+            "0": "file1",
+            "1": "dir/file2",
+        }
+        self.assertEqual(
+            self.phab.get_revision_changed_files(1234),
+            [
+                "file1",
+                "dir/file2",
+            ])
+
     def test_get_file_content_from_master(self):
         commit_hash = "0000000000000000000000000000000123456789"
         file_phid = "PHID-FILE-somefile"