diff --git a/release/build_devel.sh b/release/build_devel.sh
index 05dcaafcaa..c4ef280258 100755
--- a/release/build_devel.sh
+++ b/release/build_devel.sh
@@ -30,6 +30,7 @@ git reset --hard __nightly
 git checkout __nightly
 git reset --hard origin/devel
 git clean -xdff
+git submodule foreach --recursive git clean -xdff
 git lfs uninstall
 
 # remove everything except .git