diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 27932ef..d846cdd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,4 +27,5 @@ jobs:
       platforms: "linux/amd64, linux/arm64"
       release: true
       image_name: "${{matrix.baseimage}}-behave"
-      build_args: "SELENIUM_BASE=docker.io/selenium/${{ matrix.baseimage }}:${{ matrix.baseversion }}"
+      build_args: |
+        SELENIUM_BASE=docker.io/selenium/${{ matrix.baseimage }}:${{ matrix.baseversion }}