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diff --git a/js/src/tests/test262/language/expressions/in/private-field-in-nested.js b/js/src/tests/test262/language/expressions/in/private-field-in-nested.js
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index 0000000000..d49304e62e
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+++ b/js/src/tests/test262/language/expressions/in/private-field-in-nested.js
@@ -0,0 +1,28 @@
+// |reftest| error:SyntaxError
+// Copyright (C) 2021 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+  Can't nest `in` expressions when the left-hand side is PrivateIdentifier.
+info: |
+  Syntax
+    RelationalExpression[In, Yield, Await]:
+    [...]
+    [+In]PrivateIdentifier in ShiftExpression[?Yield, ?Await]
+esid: sec-relational-operators
+negative:
+  phase: parse
+  type: SyntaxError
+features: [class-fields-private, class-fields-private-in]
+---*/
+
+$DONOTEVALUATE();
+
+class C {
+  #field;
+
+  constructor() {
+    #field in #field in this;
+  }
+}