diff --git a/image/Dockerfile b/image/Dockerfile
index 2f1ff48..5cca6cc 100644
--- a/image/Dockerfile
+++ b/image/Dockerfile
@@ -198,6 +198,7 @@ ubuntu-20.04:docker://catthehacker/ubuntu:runner-20.04' \
   #
   GITEA_INSTANCE_INSECURE='false' \
   #
+  GITEA_RUNNER_JOB_CONTAINER_DOCKER_HOST="unix:///var/run/docker.sock" \
   GITEA_RUNNER_JOB_CONTAINER_NETWORK='bridge' \
   GITEA_RUNNER_JOB_CONTAINER_OPTIONS='' \
   GITEA_RUNNER_JOB_CONTAINER_PRIVILEGED='false' \