diff --git a/action.yml b/action.yml
index 37c885a6..d8ed8205 100644
--- a/action.yml
+++ b/action.yml
@@ -40,7 +40,7 @@ inputs:
     default: '0'
 runs:
   using: 'docker'
-  image: ${{ kicad == 5 && 'Dockerfile_k5' || 'Dockerfile_k6' }}
+  image: ${{ inputs.kicad == 5 && 'Dockerfile_k5' || 'Dockerfile_k6' }}
   args:
     -  -c ${{ inputs.config }}
     -  -d ${{ inputs.dir }}