diff --git a/src/ic.cc b/src/ic.cc
index 83677bdbcc..0bfb755d95 100644
--- a/src/ic.cc
+++ b/src/ic.cc
@@ -1022,7 +1022,7 @@ bool IC::UpdatePolymorphicIC(State state,
 
   number_of_valid_maps++;
   if (handler_to_overwrite >= 0) {
-    handlers.InsertAt(handler_to_overwrite, code);
+    handlers.Set(handler_to_overwrite, code);
   } else {
     receiver_maps.Add(new_receiver_map);
     handlers.Add(code);
diff --git a/src/list-inl.h b/src/list-inl.h
index d815a7e227..143c830ee9 100644
--- a/src/list-inl.h
+++ b/src/list-inl.h
@@ -103,6 +103,13 @@ Vector<T> List<T, P>::AddBlock(T value, int count, P alloc) {
 }
 
 
+template<typename T, class P>
+void List<T, P>::Set(int index, const T& elm) {
+  ASSERT(index >= 0 && index <= length_);
+  data_[index] = elm;
+}
+
+
 template<typename T, class P>
 void List<T, P>::InsertAt(int index, const T& elm, P alloc) {
   ASSERT(index >= 0 && index <= length_);
diff --git a/src/list.h b/src/list.h
index 43d982f687..0e4e35bb41 100644
--- a/src/list.h
+++ b/src/list.h
@@ -115,6 +115,9 @@ class List {
   void InsertAt(int index, const T& element,
                 AllocationPolicy allocator = AllocationPolicy());
 
+  // Overwrites the element at the specific index.
+  void Set(int index, const T& element);
+
   // Added 'count' elements with the value 'value' and returns a
   // vector that allows access to the elements.  The vector is valid
   // until the next change is made to this list.