diff --git a/js/src/irregexp/imported/regexp-parser.cc b/js/src/irregexp/imported/regexp-parser.cc
--- a/js/src/irregexp/imported/regexp-parser.cc
+++ b/js/src/irregexp/imported/regexp-parser.cc
@@ -4,16 +4,17 @@
 
 #include "irregexp/imported/regexp-parser.h"
 
 #include "irregexp/imported/regexp-ast.h"
 #include "irregexp/imported/regexp-macro-assembler.h"
 #include "irregexp/imported/regexp.h"
 
 #ifdef V8_INTL_SUPPORT
+#include "js/properties_glue.h"
 #include "unicode/uniset.h"
 #include "unicode/unistr.h"
 #include "unicode/usetiter.h"
 #include "unicode/utf16.h"  // For U16_NEXT
 #endif                      // V8_INTL_SUPPORT
 
 namespace v8 {
 namespace internal {
@@ -2058,17 +2059,17 @@ bool LookupSpecialPropertyValueName(cons
   } else if (NameEquals(name, "ASCII")) {
     result->Add(negate ? CharacterRange::Range(0x80, String::kMaxCodePoint)
                        : CharacterRange::Range(0x0, 0x7F),
                 zone);
   } else if (NameEquals(name, "Assigned")) {
     return LookupPropertyValueName(UCHAR_GENERAL_CATEGORY, "Unassigned",
                                    !negate, result, nullptr, flags, zone);
   } else {
-    return false;
+    return mozilla_properties_glue_add_property_ranges(static_cast<void*>(result), static_cast<void*>(zone), name, negate, IsUnicodeSets(flags) && IsIgnoreCase(flags));
   }
   return true;
 }
 
 // Explicitly allowlist supported binary properties. The spec forbids supporting
 // properties outside of this set to ensure interoperability.
 bool IsSupportedBinaryProperty(UProperty property, bool unicode_sets) {
   switch (property) {