diff --git a/src/js/typedarray.js b/src/js/typedarray.js
index 3d500a379e..359f48435a 100644
--- a/src/js/typedarray.js
+++ b/src/js/typedarray.js
@@ -785,7 +785,7 @@ function TypedArray() {
 %FunctionSetPrototype(TypedArray, new GlobalObject());
 %AddNamedProperty(TypedArray.prototype,
                   "constructor", TypedArray, DONT_ENUM);
-utils.InstallFunctions(TypedArray, DONT_ENUM | DONT_DELETE | READ_ONLY, [
+utils.InstallFunctions(TypedArray, DONT_ENUM, [
   "from", TypedArrayFrom,
   "of", TypedArrayOf
 ]);
diff --git a/test/mjsunit/es6/typedarray-of.js b/test/mjsunit/es6/typedarray-of.js
index a6df29a0dd..eaa7bde11b 100644
--- a/test/mjsunit/es6/typedarray-of.js
+++ b/test/mjsunit/es6/typedarray-of.js
@@ -115,9 +115,9 @@ function TestTypedArrayOf(constructor) {
   // Check superficial features of %TypedArray%.of.
   var desc = Object.getOwnPropertyDescriptor(constructor.__proto__, "of");
 
-  assertEquals(desc.configurable, false);
+  assertEquals(desc.configurable, true);
   assertEquals(desc.enumerable, false);
-  assertEquals(desc.writable, false);
+  assertEquals(desc.writable, true);
   assertEquals(constructor.of.length, 0);
 
   // %TypedArray%.of is not a constructor.