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diff --git a/js/src/tests/test262/language/expressions/in/private-field-invalid-assignment-target.js b/js/src/tests/test262/language/expressions/in/private-field-invalid-assignment-target.js
new file mode 100644
index 0000000000..d788f5d9e6
--- /dev/null
+++ b/js/src/tests/test262/language/expressions/in/private-field-invalid-assignment-target.js
@@ -0,0 +1,32 @@
+// |reftest| error:SyntaxError
+// Copyright 2021 the V8 project authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Rejected as assignment target
+info: |
+  12.10.5 Static Semantics: AllPrivateIdentifiersValid
+
+  AllPrivateIdentifiersValid is an abstract operation which takes names as an argument.
+
+  RelationalExpression:PrivateIdentifierinShiftExpression
+
+  1. If StringValue of PrivateIdentifier is in names, return true.
+  2. Return false.
+
+esid: sec-relational-operators-runtime-semantics-evaluation
+negative:
+  phase: parse
+  type: SyntaxError
+features: [class-fields-private, class-fields-private-in]
+---*/
+
+$DONOTEVALUATE();
+
+class C {
+  #field;
+
+  constructor() {
+    #field in {} = 0;
+  }
+}