diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 449be5384..8530cdc7a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -19,7 +19,8 @@ docker-image:
   stage: prepare
   # Must match the docker version on the build machine!
   before_script:
-    - git submodule update --init --recursive
+    - git submodule sync --recursive
+    - git submodule update --recursive --init
     - docker info
   script:
     - docker build -t $DOCKER_REGISTRY/$DOCKER_IMAGE .