diff --git a/src/flags/flag-definitions.h b/src/flags/flag-definitions.h
index 41e248c71a..92a354e60a 100644
--- a/src/flags/flag-definitions.h
+++ b/src/flags/flag-definitions.h
@@ -1022,7 +1022,8 @@ DEFINE_BOOL(turbo_collect_feedback_in_generic_lowering, false,
 DEFINE_BOOL(isolate_script_cache_ageing, true,
             "enable ageing of the isolate script cache.")
 
-DEFINE_BOOL(turboshaft, false, "enable TurboFan's Turboshaft phases for JS")
+DEFINE_EXPERIMENTAL_FEATURE(turboshaft,
+                            "enable TurboFan's Turboshaft phases for JS")
 DEFINE_BOOL(turboshaft_trace_reduction, false,
             "trace individual Turboshaft reduction steps")
 DEFINE_BOOL(turboshaft_wasm, false,