diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 57abc84..b27ef2a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,7 +26,7 @@ jobs:
         uses: actions/checkout@v3
       - name: Init composer.lock
         run: |
-          composer update --no-install $(if [[ ${{ matrix.prefer_lowest }} == 'yes ]]; then echo '--prefer-lowest'; fi)
+          composer update --no-install $(if [[ "${{ matrix.prefer_lowest }}" == 'yes ]]; then echo '--prefer-lowest'; fi)
       - name: Install dependencies
         run: composer install
       - name: Run tests