diff --git a/net/core/gen_estimator.c b/net/core/gen_estimator.c
index daadbcc4e8dd7e45d92205f6ef4810a315ce3a62..86037d16f199d2e89ff021811bf210a2e5e3503f 100644
--- a/net/core/gen_estimator.c
+++ b/net/core/gen_estimator.c
@@ -135,7 +135,7 @@ static void est_timer(unsigned long arg)
 	}
 
 	if (!list_empty(&elist[idx].list))
-		mod_timer(&elist[idx].timer, jiffies + ((HZ<<idx)/4));
+		mod_timer(&elist[idx].timer, jiffies + ((HZ/4) << idx));
 	rcu_read_unlock();
 }
 
@@ -191,7 +191,7 @@ int gen_new_estimator(struct gnet_stats_basic *bstats,
 	}
 
 	if (list_empty(&elist[idx].list))
-		mod_timer(&elist[idx].timer, jiffies + ((HZ<<idx)/4));
+		mod_timer(&elist[idx].timer, jiffies + ((HZ/4) << idx));
 
 	list_add_rcu(&est->list, &elist[idx].list);
 	return 0;