diff --git a/test/intl402/NumberFormat/constructor-no-instanceof.js b/test/intl402/NumberFormat/constructor-no-instanceof.js
new file mode 100644
index 0000000000..259c37ef66
--- /dev/null
+++ b/test/intl402/NumberFormat/constructor-no-instanceof.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2021 Igalia S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-Intl.NumberFormat.prototype.resolvedOptions
+description: >
+  Tests that Intl.NumberFormat.prototype.resolvedOptions calls
+  OrdinaryHasInstance instead of the instanceof operator which includes a
+  Symbol.hasInstance lookup and call among other things.
+---*/
+
+Object.defineProperty(Intl.NumberFormat, Symbol.hasInstance, {
+    get() { throw new Test262Error(); }
+});
+
+Intl.NumberFormat();
diff --git a/test/intl402/NumberFormat/prototype/format/no-instanceof.js b/test/intl402/NumberFormat/prototype/format/no-instanceof.js
new file mode 100644
index 0000000000..ddeed1435f
--- /dev/null
+++ b/test/intl402/NumberFormat/prototype/format/no-instanceof.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2021 Igalia S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-Intl.NumberFormat.prototype.resolvedOptions
+description: >
+  Tests that Intl.NumberFormat.prototype.resolvedOptions calls
+  OrdinaryHasInstance instead of the instanceof operator which includes a
+  Symbol.hasInstance lookup and call among other things.
+---*/
+
+const nf = new Intl.NumberFormat();
+
+Object.defineProperty(Intl.NumberFormat, Symbol.hasInstance, {
+    get() { throw new Test262Error(); }
+});
+
+nf.format;
diff --git a/test/intl402/NumberFormat/prototype/resolvedOptions/no-instanceof.js b/test/intl402/NumberFormat/prototype/resolvedOptions/no-instanceof.js
new file mode 100644
index 0000000000..55fd6fd833
--- /dev/null
+++ b/test/intl402/NumberFormat/prototype/resolvedOptions/no-instanceof.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2021 Igalia S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-Intl.NumberFormat.prototype.resolvedOptions
+description: >
+  Tests that Intl.NumberFormat.prototype.resolvedOptions calls
+  OrdinaryHasInstance instead of the instanceof operator which includes a
+  Symbol.hasInstance lookup and call among other things.
+---*/
+
+const nf = new Intl.NumberFormat();
+
+Object.defineProperty(Intl.NumberFormat, Symbol.hasInstance, {
+    get() { throw new Test262Error(); }
+});
+
+nf.resolvedOptions();