diff --git a/phpcheckstyle.cfg b/phpcheckstyle.cfg
index 843461cf..73066bd5 100644
--- a/phpcheckstyle.cfg
+++ b/phpcheckstyle.cfg
@@ -396,8 +396,8 @@
     </test>
 
     <!-- Detect unused variables -->
-    <!--<test name="checkUnusedVariables">
-    </test>-->
+    <test name="checkUnusedVariables">
+    </test>
 
     <!-- Detect unused function parameters -->
     <!--<test name="checkUnusedFunctionParameters">