diff --git a/test/mjsunit/optimized-map.js b/test/mjsunit/optimized-map.js
index 550db9249c..54d6575f8a 100644
--- a/test/mjsunit/optimized-map.js
+++ b/test/mjsunit/optimized-map.js
@@ -362,6 +362,33 @@ var c = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25];
 (function() {
   var result = 0;
   var to_double = function() {
+    var callback = function(v,i,o) {
+      result += v;
+      if (i < 5) {
+        // First transition the output array to PACKED_DOUBLE_ELEMENTS.
+        return v + 0.5;
+      } else {
+        // Then return smi values and make sure they can live in the double
+        // array.
+        return v;
+      }
+    }
+    return c.map(callback);
+  }
+  to_double();
+  to_double();
+  %OptimizeFunctionOnNextCall(to_double);
+  var output = to_double();
+  assertTrue(%HasDoubleElements(output));
+  assertEquals(1.5, output[0]);
+  assertEquals(6, output[5]);
+  assertEquals(975, result);
+  assertOptimized(to_double);
+})();
+
+(function() {
+  var result = 0;
+  var to_fast = function() {
     var callback = function(v,i,o) {
       result += v;
       if (i < 5) {
@@ -378,13 +405,14 @@ var c = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25];
     }
     return c.map(callback);
   }
-  to_double();
-  to_double();
-  %OptimizeFunctionOnNextCall(to_double);
-  var output = to_double();
+  to_fast();
+  to_fast();
+  %OptimizeFunctionOnNextCall(to_fast);
+  var output = to_fast();
+  %HasObjectElements(output);
   assertEquals(975, result);
   assertEquals("11hello", output[10]);
-  assertOptimized(to_double);
+  assertOptimized(to_fast);
 })();
 
 // Messing with the Array species constructor causes deoptimization.