diff --git a/lib/rules/no-reassign.js b/lib/rules/no-reassign.js
index 9627f2290..2e3b1339d 100644
--- a/lib/rules/no-reassign.js
+++ b/lib/rules/no-reassign.js
@@ -50,7 +50,7 @@ module.exports = function (context) {
     },
 
     'FunctionDeclaration': function (fn) {
-      checkIdentifier(fn.id)
+      if (fn.id != null) checkIdentifier(fn.id)
 
       fn.params.forEach(function (p) {
         if (p.type !== 'Identifier') return
diff --git a/tests/lib/rules/no-reassign.js b/tests/lib/rules/no-reassign.js
index ccbc3e2c4..0c3d86df8 100644
--- a/tests/lib/rules/no-reassign.js
+++ b/tests/lib/rules/no-reassign.js
@@ -11,9 +11,15 @@ eslintTester.addRuleTest('lib/rules/no-reassign', {
   valid: [
     test({code: 'import { foo } from \'./bar\'; bar = 42;'})
     // may assign to imported names\' members
-  , test({code: 'import { foo } from \'./bar\'; foo.x = 42; '}),
+  , test({code: 'import { foo } from \'./bar\'; foo.x = 42; '})
     // may assign to imported namespaces\' names\' members
-    test({code: 'import * as foo from \'./bar\'; foo.x.y = 42; '})
+  , test({code: 'import * as foo from \'./bar\'; foo.x.y = 42; '})
+
+    // ensure unnamed imports work
+  , test({code: 'import \'./bar\'; '})
+
+    // support anonymous default function
+  , test({code: 'export default function () { }'})
 
     // ensure object literals are not compromised
   , test({code: 'import * as foo from \'./bar\'; var x = {foo: 42}; '})