diff --git a/deps/v8/src/flags/flag-definitions.h b/deps/v8/src/flags/flag-definitions.h
index aab9435dbb53e5..f3d4453a745843 100644
--- a/deps/v8/src/flags/flag-definitions.h
+++ b/deps/v8/src/flags/flag-definitions.h
@@ -1085,7 +1085,7 @@ DEFINE_BOOL_READONLY(internalize_on_the_fly, true,
 
 // Flags for data representation optimizations
 DEFINE_BOOL(unbox_double_arrays, true, "automatically unbox arrays of doubles")
-DEFINE_BOOL_READONLY(string_slices, true, "use string slices")
+DEFINE_BOOL(string_slices, true, "use string slices")
 
 // Tiering: Sparkplug / feedback vector allocation.
 DEFINE_INT(invocation_count_for_feedback_allocation, 8,