diff --git a/.github/actions/ci-setup/action.yml b/.github/actions/ci-setup/action.yml
index 19df378a..9407d6d5 100644
--- a/.github/actions/ci-setup/action.yml
+++ b/.github/actions/ci-setup/action.yml
@@ -12,7 +12,6 @@ inputs:
   php-extensions:
     description: 'The PHP extensions to install'
     required: false
-    default: ''
   extensions-cache-key:
     description: 'The key used to cache PHP extensions. If empty value is provided, extension caching is disabled'
     required: true