diff --git a/lib/platform/gitlab/index.js b/lib/platform/gitlab/index.js
index a6922baf263362e4363424a1d860f3efadc00560..b7eaacac481f22383e96b137e7ef8dd8ca31a9df 100644
--- a/lib/platform/gitlab/index.js
+++ b/lib/platform/gitlab/index.js
@@ -493,9 +493,17 @@ function addReviewers(iid, reviewers) {
   logger.warn('Unimplemented in GitLab: approvals');
 }
 
-// istanbul ignore next
-function deleteLabel() {
-  throw new Error('deleteLabel not implemented');
+async function deleteLabel(issueNo, label) {
+  logger.debug(`Deleting label ${label} from #${issueNo}`);
+  try {
+    const pr = await getPr(issueNo);
+    const labels = (pr.labels || []).filter(l => l !== label).join();
+    await get.put(`projects/${config.repository}/merge_requests/${issueNo}`, {
+      body: { labels },
+    });
+  } catch (err) /* istanbul ignore next */ {
+    logger.warn({ err, issueNo, label }, 'Failed to delete label');
+  }
 }
 
 async function getComments(issueNo) {
diff --git a/test/platform/gitlab/__snapshots__/index.spec.js.snap b/test/platform/gitlab/__snapshots__/index.spec.js.snap
index db8475f51f77f249da7f35f1cb5e943a489168e5..132dc8dae00fb87c27df225c7d281df1895efdd9 100644
--- a/test/platform/gitlab/__snapshots__/index.spec.js.snap
+++ b/test/platform/gitlab/__snapshots__/index.spec.js.snap
@@ -124,6 +124,19 @@ Array [
 ]
 `;
 
+exports[`platform/gitlab deleteLabel(issueNo, label) should delete the label 1`] = `
+Array [
+  Array [
+    "projects/undefined/merge_requests/42",
+    Object {
+      "body": Object {
+        "labels": "foo,renovate",
+      },
+    },
+  ],
+]
+`;
+
 exports[`platform/gitlab ensureComment add comment if not found 1`] = `
 Array [
   Array [
diff --git a/test/platform/gitlab/index.spec.js b/test/platform/gitlab/index.spec.js
index 28ba5c7b73ecf2ebe5dbd9ac9f64fe11dbcc243c..ae9dcbb1b9186e6be171ac5628d5edee99519c59 100644
--- a/test/platform/gitlab/index.spec.js
+++ b/test/platform/gitlab/index.spec.js
@@ -1032,4 +1032,27 @@ These updates have all been created already. Click a checkbox below to force a r
       expect(res).toHaveLength(0);
     });
   });
+  describe('deleteLabel(issueNo, label)', () => {
+    it('should delete the label', async () => {
+      get.mockReturnValueOnce({
+        body: {
+          id: 1,
+          iid: 12345,
+          description: 'a merge request',
+          state: 'merged',
+          merge_status: 'cannot_be_merged',
+          diverged_commits_count: 5,
+          source_branch: 'some-branch',
+          labels: ['foo', 'renovate', 'rebase'],
+        },
+      });
+      get.mockReturnValueOnce({
+        body: {
+          commit: {},
+        },
+      });
+      await gitlab.deleteLabel(42, 'rebase');
+      expect(get.put.mock.calls).toMatchSnapshot();
+    });
+  });
 });
diff --git a/website/docs/install-gitlab-app.md b/website/docs/install-gitlab-app.md
index e16828d4fbdafd5e579710cec42837a92d192b03..a5a6f971ff3d3e5cd752bc0f6be7caa1b5e560b8 100644
--- a/website/docs/install-gitlab-app.md
+++ b/website/docs/install-gitlab-app.md
@@ -59,7 +59,3 @@ Unlike on GitHub, it is not possible to have the option to install Renovate on "
 ##### Detecting new projects
 
 Currently there is no detection mechanism in the backend scheduler to determine when Renovate has been added to a new project, so the onboarding MR won't appear instantly. Instead, the new project should be picked up during hourly scheduled runs.
-
-##### Rebasing using labels
-
-The `deleteLabel()` function is not yet implemented for the gitlab platform so requests to rebase MRs using the "rebase" label will cause an error when Renovate attempts to delete the label. Please rebase using MR titles instead.