diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 7599abd..969a83f 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -165,7 +165,7 @@
 #define ftrace_hash_unlock(flags) spin_lock_irqsave(&ftrace_hash_lock, flags)
 #else
 /* This is protected via the ftrace_lock with MCOUNT_RECORD. */
-#define ftrace_hash_lock(flags)   do { (void)flags; } while (0)
+#define ftrace_hash_lock(flags)   do { (void)(flags); } while (0)
 #define ftrace_hash_unlock(flags) do { } while(0)
 #endif