diff --git a/roles/openshift-apps/fedora-ostree-pruner/templates/deploymentconfig.yml b/roles/openshift-apps/fedora-ostree-pruner/templates/deploymentconfig.yml
index 9fc3326522..8d736cb897 100644
--- a/roles/openshift-apps/fedora-ostree-pruner/templates/deploymentconfig.yml
+++ b/roles/openshift-apps/fedora-ostree-pruner/templates/deploymentconfig.yml
@@ -28,6 +28,10 @@ spec:
         image: ""
         imagePullPolicy: IfNotPresent
         resources: {}
+      # The files in the ostree volumes are created with group ownership of 263.
+      # We need to have 263 in our supplemental groups. See https://pagure.io/releng/issue/8811#comment-629051
+      securityContext:
+        supplementalGroups: [263]
       volumes:
       - name: fedora-ostree-content-volume
         persistentVolumeClaim: