diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 430d67c4c8cda..12e4508dcea8b 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -39,7 +39,6 @@ jobs:
       - name: Configure for PHP 8.1
         if: "${{ matrix.php == '8.1' }}"
         run: |
-          echo "extensions=mbstring" >> $GITHUB_ENV
           composer config platform.php 8.0.99
 
       - name: Setup PHP