diff --git a/.github/workflows/_run.yml b/.github/workflows/_run.yml
index ef4fedeae34a..5e327e2b00f2 100644
--- a/.github/workflows/_run.yml
+++ b/.github/workflows/_run.yml
@@ -291,6 +291,10 @@ jobs:
           ${{ inputs.bazel-extra }}
           ${{ inputs.rbe == true && format('--jobs={0}', inputs.bazel-rbe-jobs) || '' }}
         BAZEL_FAKE_SCM_REVISION: ${{ github.event_name == 'pull_request' && 'e3b4a6e9570da15ac1caffdded17a8bebdc7dfc9' || '' }}
+        CI_BRANCH: >-
+          ${{ inputs.trusted
+              && format('refs/heads/{0}, fromJSON(inputs.request).request.target-branch)
+              || '' }}
         CI_SHA1: ${{ github.sha }}
         CI_TARGET_BRANCH: ${{ fromJSON(inputs.request).request.target-branch }}
         MOUNT_GPG_HOME: ${{ inputs.import-gpg && 1 || '' }}