diff --git a/phpcs.xml.dist b/phpcs.xml.dist
index 1b984f8..dc61535 100644
--- a/phpcs.xml.dist
+++ b/phpcs.xml.dist
@@ -2,7 +2,11 @@
 <ruleset name="SilverStripe">
     <description>CodeSniffer ruleset for SilverStripe coding conventions.</description>
 
-    <rule ref="PSR2" >
+    <file>src</file>
+    <file>tests</file>
+
+    <!-- base rules are PSR-2 -->
+    <rule ref="PSR2">
         <!-- Current exclusions -->
         <exclude name="PSR1.Methods.CamelCapsMethodName" />
     </rule>