diff --git a/raft/rafttest/network_test.go b/raft/rafttest/network_test.go
index 6a2c88116..f5bc16049 100644
--- a/raft/rafttest/network_test.go
+++ b/raft/rafttest/network_test.go
@@ -52,7 +52,7 @@ func TestNetworkDelay(t *testing.T) {
 
 	w := time.Duration(float64(sent)*delayrate/2) * delay
 	// there are pretty overhead in the send call, since it genarete random numbers.
-	if total < w+10*delay {
+	if total < w {
 		t.Errorf("total = %v, want > %v", total, w)
 	}
 }