diff --git a/checkstyle_checks.xml b/checkstyle_checks.xml
index 3870f7080..5612ed126 100644
--- a/checkstyle_checks.xml
+++ b/checkstyle_checks.xml
@@ -114,7 +114,7 @@
     <module name="LocalFinalVariableName"/>
     <module name="LocalVariableName"/>
     <module name="MemberName">
-      <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
+      <property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9]*$"/>
     </module>
     <module name="MethodLength"/>
     <module name="MethodName"/>