diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3781f3b..4ee3577 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -21,13 +21,16 @@ jobs:
         with:
           command: asdf-plugin-manager version
       - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
-      - name: Install asdf-plugin-manager
+      - name: Test asdf-plugin-manager plugin
         run: |
           asdf plugin add asdf-plugin-manager .
           asdf install asdf-plugin-manager latest
+          asdf plugin list --urls --refs
           asdf global asdf-plugin-manager latest
-      - name: Test asdf-plugin-manager
+          asdf plugin remove asdf-plugin-manager
+      - name: Test asdf-plugin-manager cli
         run: |
+          cp -a cli/asdf-plugin-manager.sh /usr/local/bin/asdf-plugin-manager
           cd test
           asdf-plugin-manager list
           asdf-plugin-manager add-all
diff --git a/cli/asdf-plugin-manager.sh b/cli/asdf-plugin-manager.sh
index 26c5b19..ea9837a 100755
--- a/cli/asdf-plugin-manager.sh
+++ b/cli/asdf-plugin-manager.sh
@@ -82,7 +82,7 @@ add_plugins() {
     echo "${managed_plugins}" | while read managed_plugin; do
         read -r plugin_name plugin_url plugin_ref < <(echo ${managed_plugin})
         echo "[INFO] Adding: ${plugin_name} ${plugin_url} ${plugin_ref}"
-        if [[ "${ADD_CLEAN,,}" == 'true' ]]; then
+        if [[ "$(echo ${ADD_CLEAN} | tr '[:upper:]' '[:lower:]')" == 'true' ]]; then
             remove_plugins "$(list_plugins ${plugin_name})"
         fi
         asdf plugin add "${plugin_name}" "${plugin_url}"