diff --git a/phpcs.xml b/phpcs.xml
index e0fac90e0145fe8c3f549ac84e1359c2e3edebb7..cf02a457094b50c6f412717cd6cab99fc24ffb29 100644
--- a/phpcs.xml
+++ b/phpcs.xml
@@ -33,5 +33,9 @@
     <rule ref="PSR1.Methods.CamelCapsMethodName">
         <exclude-pattern>lib/SimpleSAML/XHTML/Template.php</exclude-pattern>
     </rule>
+
+    <rule ref="PSR1.Files.SideEffects">
+        <exclude-pattern>src/_autoload_modules.php</exclude-pattern>
+    </rule>
 </ruleset>