diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 50334926..9299e527 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -246,7 +246,7 @@ jobs:
       - uses: ./build-infection/.github/actions/setup-php
         with:
           php-version: "${{ matrix.php-version }}"
-          extensions: mbstring
+          php-extensions: mbstring
 
       - name: "Install dependencies"
         run: "composer install --no-interaction --no-progress"