diff --git a/lib/timers.js b/lib/timers.js
index 99010d424a..bec1d2e218 100644
--- a/lib/timers.js
+++ b/lib/timers.js
@@ -439,7 +439,7 @@ exports.clearInterval = function(timer) {
 };
 
 
-const Timeout = function(after) {
+function Timeout(after) {
   this._called = false;
   this._idleTimeout = after;
   this._idlePrev = this;
diff --git a/test/message/timeout_throw.out b/test/message/timeout_throw.out
index 1e545a1db1..2a049a157a 100644
--- a/test/message/timeout_throw.out
+++ b/test/message/timeout_throw.out
@@ -2,6 +2,6 @@
   undefined_reference_error_maker;
   ^
 ReferenceError: undefined_reference_error_maker is not defined
-    at ._onTimeout (*test*message*timeout_throw.js:*:*)
+    at Timeout._onTimeout (*test*message*timeout_throw.js:*:*)
     at tryOnTimeout (timers.js:*:*)
     at Timer.listOnTimeout (timers.js:*:*)