diff --git a/src/jsutils/__tests__/instanceOf-test.js b/src/jsutils/__tests__/instanceOf-test.js
index 2fa4fb39fd..3739587c5f 100644
--- a/src/jsutils/__tests__/instanceOf-test.js
+++ b/src/jsutils/__tests__/instanceOf-test.js
@@ -2,7 +2,6 @@ import { expect } from 'chai';
 import { describe, it } from 'mocha';
 
 import { instanceOf } from '../instanceOf';
-import { SYMBOL_TO_STRING_TAG } from '../../polyfills/symbols';
 import {
   GraphQLScalarType,
   GraphQLObjectType,
@@ -57,13 +56,13 @@ describe('instanceOf', () => {
     }
 
     function getTag(from: any): string {
-      return from[SYMBOL_TO_STRING_TAG];
+      return from[Symbol.toStringTag];
     }
 
     it('does not fail if dynamically-defined tags differ', () => {
       checkSameNameClasses((tag) => {
         class Foo {}
-        Object.defineProperty(Foo.prototype, SYMBOL_TO_STRING_TAG, {
+        Object.defineProperty(Foo.prototype, Symbol.toStringTag, {
           value: tag,
         });
         return Foo;
@@ -73,7 +72,7 @@ describe('instanceOf', () => {
     it('does not fail if dynamically-defined tag getters differ', () => {
       checkSameNameClasses((tag) => {
         class Foo {}
-        Object.defineProperty(Foo.prototype, SYMBOL_TO_STRING_TAG, {
+        Object.defineProperty(Foo.prototype, Symbol.toStringTag, {
           get() {
             return tag;
           },
@@ -85,7 +84,7 @@ describe('instanceOf', () => {
     it('does not fail for anonymous classes', () => {
       checkSameNameClasses((tag) => {
         const Foo = class {};
-        Object.defineProperty(Foo.prototype, SYMBOL_TO_STRING_TAG, {
+        Object.defineProperty(Foo.prototype, Symbol.toStringTag, {
           get() {
             return tag;
           },
@@ -97,7 +96,7 @@ describe('instanceOf', () => {
     it('does not fail if prototype property tags differ', () => {
       checkSameNameClasses((tag) => {
         class Foo {}
-        (Foo.prototype: any)[SYMBOL_TO_STRING_TAG] = tag;
+        (Foo.prototype: any)[Symbol.toStringTag] = tag;
         return Foo;
       });
     });
@@ -106,7 +105,7 @@ describe('instanceOf', () => {
       checkSameNameClasses((tag) => {
         class Foo {
           // $FlowFixMe[unsupported-syntax] Flow doesn't support computed properties yet
-          get [SYMBOL_TO_STRING_TAG]() {
+          get [Symbol.toStringTag]() {
             return tag;
           }
         }
diff --git a/src/jsutils/instanceOf.js b/src/jsutils/instanceOf.js
index 638c483c65..02b62999fd 100644
--- a/src/jsutils/instanceOf.js
+++ b/src/jsutils/instanceOf.js
@@ -1,5 +1,3 @@
-import { SYMBOL_TO_STRING_TAG } from '../polyfills/symbols';
-
 /**
  * A replacement for instanceof which includes an error warning when multi-realm
  * constructors are detected.
@@ -18,7 +16,7 @@ export const instanceOf: (mixed, mixed) => boolean =
         }
         if (value) {
           const proto = constructor && constructor.prototype;
-          const classTag = proto && proto[SYMBOL_TO_STRING_TAG];
+          const classTag = proto && proto[Symbol.toStringTag];
           const className = classTag || constructor.name;
           // When the constructor class defines a Symbol.toStringTag
           // property, as most classes exported by graphql-js do, use it
@@ -32,8 +30,8 @@ export const instanceOf: (mixed, mixed) => boolean =
           // they could be minified to the same short string, even though
           // value is legitimately _not_ instanceof constructor.
           const valueName = classTag
-                ? value[SYMBOL_TO_STRING_TAG]
-                : value.constructor && value.constructor.name;
+            ? value[Symbol.toStringTag]
+            : value.constructor && value.constructor.name;
           if (typeof className === 'string' && valueName === className) {
             throw new Error(
               `Cannot use ${className} "${value}" from another module or realm.