diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2eb1bb2..8270157 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -30,12 +30,13 @@ jobs:
       - name: Setup LXD
         uses: ./
         with:
-          channel: 5.0/stable
+          # use a channel that is not the default on ubuntu-latest
+          channel: 4.0/stable
 
       - name: Check LXD version
         shell: bash
         run: |
-          [[ $(lxd version) == 5.0* ]]
+          [[ $(lxd version) == 4.0* ]]
 
       - name: Launch container
         run: |
diff --git a/action.yml b/action.yml
index 404fb46..5509847 100644
--- a/action.yml
+++ b/action.yml
@@ -10,7 +10,7 @@ runs:
   steps:
 
     - name: Install LXD if not present
-      if: "${{ github.event.inputs.channel == '' }}"
+      if: "${{ inputs.channel == '' }}"
       shell: bash
       run: |
         if ! snap info lxd | grep "installed"; then
@@ -18,7 +18,7 @@ runs:
         fi
 
     - name: Install/refresh LXD snap
-      if: "${{ github.event.inputs.channel != '' }}"
+      if: "${{ inputs.channel != '' }}"
       shell: bash
       run: |
         set -x