diff --git a/src/test/resources/team/checkstyle-rules.xml b/src/test/resources/team/checkstyle-rules.xml
index 9246405b..eb977721 100644
--- a/src/test/resources/team/checkstyle-rules.xml
+++ b/src/test/resources/team/checkstyle-rules.xml
@@ -104,9 +104,9 @@
         <module name="OuterTypeFilename"/>
         <module name="PackageName"/>
         <!--module name="ParameterAssignment" /-->
-        <!--module name="ParameterName">
-            <property name="format" value="(?:^_[a-zA-Z0-9]*$)"/>
-        </module-->
+        <module name="ParameterName">
+            <property name="format" value="^_?[a-zA-Z0-9]*$"/>
+        </module>
         <module name="ParameterNumber">
             <property name="max" value="10"/>
         </module>
@@ -158,3 +158,4 @@
     </module>
 
 </module>
+