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diff --git a/test/language/literals/regexp/u-invalid-optional-negative-lookbehind.js b/test/language/literals/regexp/u-invalid-optional-negative-lookbehind.js
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+++ b/test/language/literals/regexp/u-invalid-optional-negative-lookbehind.js
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+// Copyright (C) 2018 Igalia S. L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-regular-expressions-patterns
+description: Lookbehinds are not treated as a QuantifiableAssertion
+info: |
+    Term[U] ::
+         [~U] QuantifiableAssertion Quantifier
+
+    QuantifiableAssertion[N]::
+        ( ? = Disjunction[~U, ?N] )
+        ( ? ! Disjunction[~U, ?N] )
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+/.(?<!.)?/u;