diff --git a/spec/acceptance/php_spec.rb b/spec/acceptance/php_spec.rb
index 3d7f0dd7..298a3b8e 100644
--- a/spec/acceptance/php_spec.rb
+++ b/spec/acceptance/php_spec.rb
@@ -40,6 +40,11 @@
                        when %r{ubuntu-18.04}
                          <<-EOS
                           'bz2'       => {},
+                          'curl'      => {},
+                          'intl'      => {},
+                          'json'      => {},
+                          'mbstring'  => {},
+                          'zip'       => {},
                           'net-url'  => {
                             package_prefix => 'php-',
                             settings       => {