diff --git a/test/clash_test.go b/test/clash_test.go
index e7f478941f..15a634b0af 100644
--- a/test/clash_test.go
+++ b/test/clash_test.go
@@ -658,7 +658,7 @@ func benchmarkProxy(b *testing.B, proxy C.ProxyAdapter) {
 		b.SetBytes(chunkSize)
 		buf := make([]byte, chunkSize)
 		for i := 0; i < b.N; i++ {
-			conn.Read(buf)
+			io.ReadFull(conn, buf)
 		}
 	})
 }