diff --git a/src/lint/linter/ArcanistLinter.php b/src/lint/linter/ArcanistLinter.php
--- a/src/lint/linter/ArcanistLinter.php
+++ b/src/lint/linter/ArcanistLinter.php
@@ -227,7 +227,7 @@
     return $this;
   }
 
-  final public function setCustomSeverityRules(array $rules) {
+  public function setCustomSeverityRules(array $rules) {
     $this->customSeverityRules = $rules;
     return $this;
   }