--- a/intl/lwbrk/LineBreaker.cpp	2023-11-16 17:42:54.000000000 +0000
+++ b/intl/lwbrk/LineBreaker.cpp	2023-11-28 18:39:40.735654246 +0000
@@ -448,12 +448,18 @@ static int8_t GetClass(uint32_t u, LineB
       /* REGIONAL_INDICATOR = 39,           [RI] */ CLASS_CHARACTER,
       /* E_BASE = 40,                       [EB] */ CLASS_BREAKABLE,
       /* E_MODIFIER = 41,                   [EM] */ CLASS_CHARACTER,
-      /* ZWJ = 42,                          [ZWJ]*/ CLASS_CHARACTER};
-
-  static_assert(U_LB_COUNT == mozilla::ArrayLength(sUnicodeLineBreakToClass),
+      /* ZWJ = 42,                          [ZWJ]*/ CLASS_CHARACTER,
+      /* AKSARA = 43,                       [AK] */ CLASS_CHARACTER,
+      /* AKSARA_PREBASE = 44,               [AP] */ CLASS_CHARACTER,
+      /* AKSARA_START = 45,                 [AS] */ CLASS_CHARACTER,
+      /* VIRAMA_FINAL = 46,                 [VF] */ CLASS_CHARACTER,
+      /* VIRAMA = 47,                       [VI] */ CLASS_CHARACTER,
+  };
+ 
+  static_assert(U_LB_COUNT <= mozilla::ArrayLength(sUnicodeLineBreakToClass),
                 "Gecko vs ICU LineBreak class mismatch");

   auto cls = GetLineBreakClass(u);
   MOZ_ASSERT(cls < mozilla::ArrayLength(sUnicodeLineBreakToClass));