@@ -364,7 +364,7 @@ MaybeLocal<Function> DynamicLibrary::CreateFunction(
   }
   ret->SetName(name_str.As<String>());
 
-  if (!ret->Set(
+  if (!ret->CreateDataProperty(
               context,
               env->pointer_string(),
               BigInt::NewFromUnsigned(
 
@@ -92,11 +92,16 @@ test('DynamicLibrary exposes functions and symbols', () => {
   const lib = new ffi.DynamicLibrary(libraryPath);
 
   try {
+    // An inherited non-writable `pointer` must not shadow the address.
+    Object.defineProperty(Function.prototype, 'pointer', {
+      value: 1, writable: false, configurable: true,
+    });
     const addI32 = lib.getFunction('add_i32', fixtureSymbols.add_i32);
     const addU64 = lib.getFunction('add_u64', {
       return: 'u64',
       arguments: ['u64', 'u64'],
     });
+    delete Function.prototype.pointer;
     const addI32Ptr = lib.getSymbol('add_i32');
 
     assert.strictEqual(addI32(20, 22), 42);
Original file line number	Diff line number	Diff line change
`@@ -364,7 +364,7 @@ MaybeLocal<Function> DynamicLibrary::CreateFunction(`
`364`	`364`	`}`
`365`	`365`	`ret->SetName(name_str.As<String>());`
`366`	`366`
`367`		`- if (!ret->Set(`
	`367`	`+ if (!ret->CreateDataProperty(`
`368`	`368`	`context,`
`369`	`369`	`env->pointer_string(),`
`370`	`370`	`BigInt::NewFromUnsigned(`