diff --git a/keylock/speed_test.go b/keylock/speed_test.go
index 5a3daf0..783e200 100644
--- a/keylock/speed_test.go
+++ b/keylock/speed_test.go
@@ -14,6 +14,7 @@ func BenchmarkMutex_Baseline(b *testing.B) {
 	b.RunParallel(func(pb *testing.PB) {
 		for pb.Next() {
 			mu.Lock()
+			_ = 0
 			mu.Unlock()
 		}
 	})