diff --git a/pro/generate-documentation-qmd/action.yml b/pro/generate-documentation-qmd/action.yml
index 74f9fbb..47b3112 100644
--- a/pro/generate-documentation-qmd/action.yml
+++ b/pro/generate-documentation-qmd/action.yml
@@ -111,7 +111,7 @@ runs:
         fi
 
         if [ "${{ inputs.clean }}" == "true" ]; then
-          extra_args+=(--clean")
+          extra_args+=("--clean")
         fi
 
         $RUNNER_TEMP/viash_tools/target/docker/quarto/generate_documentation_qmd/generate_documentation_qmd \