diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 890e7e2..7420152 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -73,8 +73,6 @@ jobs:
           php-version: ${{ matrix.php }}
           extensions: mysql, mysqli
           coverage: none
-          # The PHP 5.6 and 7.0 images don't include mysql[i] by default.
-          extensions: mysqli
 
       - name: Set up WordPress
         run: phpunit/install.sh wordpress_test root '' 127.0.0.1:3306 ${{ matrix.wp }}