diff --git a/tests/phpcs.xml b/tests/phpcs.xml
index 9e926065b..1c2db0d35 100755
--- a/tests/phpcs.xml
+++ b/tests/phpcs.xml
@@ -23,6 +23,9 @@
   <!-- Exclude all JS library files. -->
   <exclude-pattern>*library*\.js</exclude-pattern>
   <exclude-pattern>*libraries*\.js</exclude-pattern>
+  
+  <!-- Exclude node_modules directory -->
+  <exclude-pattern>web/themes/custom/*/node_modules/*</exclude-pattern>
 
   <!-- Exclude all features-generated files. -->
   <exclude-pattern>*\.bean\.*</exclude-pattern>