diff --git a/test/external/fetch-repos.sh b/test/external/fetch-repos.sh
index c73c2aa5..9c0e565a 100755
--- a/test/external/fetch-repos.sh
+++ b/test/external/fetch-repos.sh
@@ -71,12 +71,12 @@ case "$actionname" in
 			if [ ! -d "$EXT_TEST_REPO" ]; then
 				git clone "https://$EXT_TEST_DOMAIN/$EXT_TEST_OWNER/$EXT_TEST_REPO" \
 					--revision="$EXT_TEST_COMMIT" --depth=1 --recursive --shallow-submodules \
-					--jobs=0 --config advice.detachedHead=false
+					--jobs="$(getconf _NPROCESSORS_ONLN)" --config advice.detachedHead=false
 				pushd "$EXT_TEST_REPO"
 			else
 				pushd "$EXT_TEST_REPO"
 				git remote set-url origin "https://$EXT_TEST_DOMAIN/$EXT_TEST_OWNER/$EXT_TEST_REPO"
-				git fetch --depth=1 --recurse-submodules --jobs=0 origin -- "$EXT_TEST_COMMIT"
+				git fetch --depth=1 --recurse-submodules --jobs="$(getconf _NPROCESSORS_ONLN)" origin -- "$EXT_TEST_COMMIT"
 				git checkout --force --detach "$EXT_TEST_COMMIT" --
 			fi
 			if [ -f "../patches/$EXT_TEST_REPO.patch" ]; then