diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index dbc9655d..79ce65fc 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -83,7 +83,7 @@ jobs:
       - uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php-version }}
-          extensions: none, curl, dom, json, mbstring, opcache, openssl, simplexml, tokenizer, xml, xmlwriter
+          extensions: none, ctype, curl, dom, json, mbstring, opcache, openssl, simplexml, tokenizer, xml, xmlwriter
           ini-values: pcov.directory=$GITHUB_WORKSPACE/src, zend.assertions=1
           coverage: ${{ (matrix.calculate-coverage && 'pcov') || 'none' }}