diff --git a/action.yml b/action.yml
index 2df589d..9ff0341 100644
--- a/action.yml
+++ b/action.yml
@@ -18,12 +18,12 @@ runs:
       run: |
         if [[ ! -z "${{ inputs.repo }}" ]]
         then
-          REPO_ARGS=-C "${{ inputs.repo }}"
+          REPO_ARGS=(-C "${{ inputs.repo }}")
         else
-          REPO_ARGS=
+          REPO_ARGS=()
         fi
         
-        SUBMODULES="$(git $REPO_ARGS submodule)"
+        SUBMODULES="$(git "${REPO_ARGS[@]}" submodule)"
         if [[ $? -ne 0 ]]
         then
           echo ERROR git submodule failed