diff --git a/contrib/jenkins-build-common.sh b/contrib/jenkins-build-common.sh
index 4a17d4d..b41fc05 100644
--- a/contrib/jenkins-build-common.sh
+++ b/contrib/jenkins-build-common.sh
@@ -102,6 +102,8 @@
 
   echo "$(git rev-parse HEAD) $repo" >> "$prefix_real/${name}_git_hashes.txt"
 
+  git submodule update --init
+
   cd "$base"
 }