diff --git a/src/flags/flag-definitions.h b/src/flags/flag-definitions.h
index 7f216bea0d..41e248c71a 100644
--- a/src/flags/flag-definitions.h
+++ b/src/flags/flag-definitions.h
@@ -478,8 +478,8 @@ DEFINE_BOOL(lower_tier_as_toptier, false,
 #define V8_ENABLE_MAGLEV_BOOL true
 DEFINE_BOOL(maglev, false, "enable the maglev optimizing compiler")
 DEFINE_WEAK_IMPLICATION(future, maglev)
-DEFINE_BOOL(maglev_inlining, false,
-            "enable inlining in the maglev optimizing compiler")
+DEFINE_EXPERIMENTAL_FEATURE(maglev_inlining,
+                            "enable inlining in the maglev optimizing compiler")
 DEFINE_BOOL(maglev_reuse_stack_slots, true,
             "reuse stack slots in the maglev optimizing compiler")