diff --git a/coder_sniffer/Drupal/ruleset.xml b/coder_sniffer/Drupal/ruleset.xml
index 52e47197..ac74554e 100644
--- a/coder_sniffer/Drupal/ruleset.xml
+++ b/coder_sniffer/Drupal/ruleset.xml
@@ -135,6 +135,7 @@
    <property name="spacesCountAroundEqualsSign" value="0"/>
   </properties>
  </rule>
+ <rule ref="SlevomatCodingStandard.TypeHints.NullableTypeForNullDefaultValue" />
 
  <rule ref="Squiz.Arrays.ArrayDeclaration" />
  <!-- Disable some error messages that we do not want. -->