diff --git a/src/lint/linter/xhpast/rules/ArcanistDefaultParametersXHPASTLinterRule.php b/src/lint/linter/xhpast/rules/ArcanistDefaultParametersXHPASTLinterRule.php
--- a/src/lint/linter/xhpast/rules/ArcanistDefaultParametersXHPASTLinterRule.php
+++ b/src/lint/linter/xhpast/rules/ArcanistDefaultParametersXHPASTLinterRule.php
@@ -24,10 +24,12 @@
 
       foreach ($parameters as $parameter) {
         $default_value = $parameter->getChildByIndex(2);
+        $is_variadic_argument =
+          $parameter->getChildByIndex(1)->getTypeName() === 'n_UNPACK';
 
         if ($default_value->getTypeName() != 'n_EMPTY') {
           $default_found = true;
-        } else if ($default_found) {
+        } else if (!$is_variadic_argument && $default_found) {
           $this->raiseLintAtNode(
             $parameter_list,
             pht(
diff --git a/src/lint/linter/xhpast/rules/__tests__/default-parameters/default-parameters.lint-test b/src/lint/linter/xhpast/rules/__tests__/default-parameters/default-parameters.lint-test
--- a/src/lint/linter/xhpast/rules/__tests__/default-parameters/default-parameters.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/default-parameters/default-parameters.lint-test
@@ -7,6 +7,8 @@
 class MyClass {
   public function myMethod($x, $y = null, $z) {}
 }
+
+function variadic_fun($x, $y = null, ...$params) {}
 ~~~~~~~~~~
 warning:4:13
 warning:8:27