diff --git a/src/objects.cc b/src/objects.cc
index b37cf3b43c..8651ee649d 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -4306,7 +4306,8 @@ MaybeHandle<Object> JSObject::SetLocalPropertyIgnoreAttributes(
     PropertyAttributes attributes,
     ValueType value_type,
     StoreMode mode,
-    ExtensibilityCheck extensibility_check) {
+    ExtensibilityCheck extensibility_check,
+    StoreFromKeyed store_from_keyed) {
   Isolate* isolate = object->GetIsolate();
 
   // Make sure that the top context does not change when doing callbacks or
@@ -4347,7 +4348,7 @@ MaybeHandle<Object> JSObject::SetLocalPropertyIgnoreAttributes(
         ? OMIT_TRANSITION : INSERT_TRANSITION;
     // Neither properties nor transitions found.
     return AddProperty(object, name, value, attributes, SLOPPY,
-        MAY_BE_STORE_FROM_KEYED, extensibility_check, value_type, mode, flag);
+        store_from_keyed, extensibility_check, value_type, mode, flag);
   }
 
   Handle<Object> old_value = isolate->factory()->the_hole_value();
diff --git a/src/objects.h b/src/objects.h
index 0291e850b9..4ea399e1bb 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2159,7 +2159,8 @@ class JSObject: public JSReceiver {
       PropertyAttributes attributes,
       ValueType value_type = OPTIMAL_REPRESENTATION,
       StoreMode mode = ALLOW_AS_CONSTANT,
-      ExtensibilityCheck extensibility_check = PERFORM_EXTENSIBILITY_CHECK);
+      ExtensibilityCheck extensibility_check = PERFORM_EXTENSIBILITY_CHECK,
+      StoreFromKeyed store_mode = MAY_BE_STORE_FROM_KEYED);
 
   static inline Handle<String> ExpectedTransitionKey(Handle<Map> map);
   static inline Handle<Map> ExpectedTransitionTarget(Handle<Map> map);
diff --git a/src/runtime.cc b/src/runtime.cc
index b1f9e1fd23..c60b804618 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -5290,7 +5290,9 @@ RUNTIME_FUNCTION(Runtime_DefineOrRedefineDataProperty) {
   Handle<Object> result;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, result,
-      Runtime::ForceSetObjectProperty(js_object, name, obj_value, attr));
+      Runtime::ForceSetObjectProperty(
+          js_object, name, obj_value, attr,
+          JSReceiver::CERTAINLY_NOT_STORE_FROM_KEYED));
   return *result;
 }
 
@@ -5402,10 +5404,12 @@ MaybeHandle<Object> Runtime::SetObjectProperty(Isolate* isolate,
 }
 
 
-MaybeHandle<Object> Runtime::ForceSetObjectProperty(Handle<JSObject> js_object,
-                                                    Handle<Object> key,
-                                                    Handle<Object> value,
-                                                    PropertyAttributes attr) {
+MaybeHandle<Object> Runtime::ForceSetObjectProperty(
+    Handle<JSObject> js_object,
+    Handle<Object> key,
+    Handle<Object> value,
+    PropertyAttributes attr,
+    JSReceiver::StoreFromKeyed store_from_keyed) {
   Isolate* isolate = js_object->GetIsolate();
   // Check if the given key is an array index.
   uint32_t index;
@@ -5433,7 +5437,9 @@ MaybeHandle<Object> Runtime::ForceSetObjectProperty(Handle<JSObject> js_object,
     } else {
       if (name->IsString()) name = String::Flatten(Handle<String>::cast(name));
       return JSObject::SetLocalPropertyIgnoreAttributes(
-          js_object, name, value, attr);
+          js_object, name, value, attr, Object::OPTIMAL_REPRESENTATION,
+          ALLOW_AS_CONSTANT, JSReceiver::PERFORM_EXTENSIBILITY_CHECK,
+          store_from_keyed);
     }
   }
 
@@ -5447,8 +5453,10 @@ MaybeHandle<Object> Runtime::ForceSetObjectProperty(Handle<JSObject> js_object,
     return JSObject::SetElement(js_object, index, value, attr,
                                 SLOPPY, false, DEFINE_PROPERTY);
   } else {
-    return JSObject::SetLocalPropertyIgnoreAttributes(js_object, name, value,
-                                                      attr);
+    return JSObject::SetLocalPropertyIgnoreAttributes(
+        js_object, name, value, attr, Object::OPTIMAL_REPRESENTATION,
+        ALLOW_AS_CONSTANT, JSReceiver::PERFORM_EXTENSIBILITY_CHECK,
+        store_from_keyed);
   }
 }
 
diff --git a/src/runtime.h b/src/runtime.h
index fa478ddf68..a52811f07c 100644
--- a/src/runtime.h
+++ b/src/runtime.h
@@ -820,7 +820,9 @@ class Runtime : public AllStatic {
       Handle<JSObject> object,
       Handle<Object> key,
       Handle<Object> value,
-      PropertyAttributes attr);
+      PropertyAttributes attr,
+      JSReceiver::StoreFromKeyed store_from_keyed
+        = JSReceiver::MAY_BE_STORE_FROM_KEYED);
 
   MUST_USE_RESULT static MaybeHandle<Object> DeleteObjectProperty(
       Isolate* isolate,
diff --git a/test/mjsunit/regress/regress-362870.js b/test/mjsunit/regress/regress-362870.js
new file mode 100644
index 0000000000..c8d3fe7e4b
--- /dev/null
+++ b/test/mjsunit/regress/regress-362870.js
@@ -0,0 +1,18 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax
+
+// Adding a property via Object.defineProperty should not be taken as hint that
+// we construct a dictionary, quite the opposite.
+var obj = {};
+
+for (var i = 0; i < 100; i++) {
+  Object.defineProperty(obj, "x" + i, { value: 31415 });
+  Object.defineProperty(obj, "y" + i, {
+    get: function() { return 42; },
+    set: function(value) { }
+  });
+  assertTrue(%HasFastProperties(obj));
+}