diff --git a/js/src/builtin/Utilities.js b/js/src/builtin/Utilities.js
index 1dcff5f67917..bfb1fe7f45d0 100644
--- a/js/src/builtin/Utilities.js
+++ b/js/src/builtin/Utilities.js
@@ -148,7 +148,7 @@ function GetIterator(obj, method) {
 
     // Step 5.
     if (!IsObject(iterator))
-        ThrowTypeError(JSMSG_NOT_ITERABLE, ToString(iterator));
+        ThrowTypeError(JSMSG_NOT_ITERATOR, ToString(iterator));
 
     // Step 6.
     return iterator;
diff --git a/js/src/js.msg b/js/src/js.msg
index 2c422179dc55..abe9509477ea 100644
--- a/js/src/js.msg
+++ b/js/src/js.msg
@@ -92,6 +92,7 @@ MSG_DEF(JSMSG_BAD_GET_SET_FIELD,       1, JSEXN_TYPEERR, "property descriptor's
 MSG_DEF(JSMSG_THROW_TYPE_ERROR,        0, JSEXN_TYPEERR, "'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them")
 MSG_DEF(JSMSG_NOT_EXPECTED_TYPE,       3, JSEXN_TYPEERR, "{0}: expected {1}, got {2}")
 MSG_DEF(JSMSG_NOT_ITERABLE,            1, JSEXN_TYPEERR, "{0} is not iterable")
+MSG_DEF(JSMSG_NOT_ITERATOR,            1, JSEXN_TYPEERR, "{0} is not iterator")
 MSG_DEF(JSMSG_ALREADY_HAS_PRAGMA,      2, JSEXN_WARN, "{0} is being assigned a {1}, but already has one")
 MSG_DEF(JSMSG_GET_ITER_RETURNED_PRIMITIVE, 0, JSEXN_TYPEERR, "[Symbol.iterator]() returned a non-object value")
 MSG_DEF(JSMSG_NEXT_RETURNED_PRIMITIVE, 0, JSEXN_TYPEERR, "iterator.next() returned a non-object value")