diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index b9616f1..d861db8 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -8674,7 +8674,7 @@ int sched_dynamic_mode(const char *str)
 #error "Unsupported PREEMPT_DYNAMIC mechanism"
 #endif
 
-DEFINE_MUTEX(sched_dynamic_mutex);
+static DEFINE_MUTEX(sched_dynamic_mutex);
 static bool klp_override;
 
 static void __sched_dynamic_update(int mode)