diff --git a/Tethering/tests/integration/src/android/net/EthernetTetheringTest.java b/Tethering/tests/integration/src/android/net/EthernetTetheringTest.java
index 880a285..c6d2b3b 100644
--- a/Tethering/tests/integration/src/android/net/EthernetTetheringTest.java
+++ b/Tethering/tests/integration/src/android/net/EthernetTetheringTest.java
@@ -139,6 +139,9 @@
     // Kernel treats a confirmed UDP connection which active after two seconds as stream mode.
     // See upstream commit b7b1d02fc43925a4d569ec221715db2dfa1ce4f5.
     private static final int UDP_STREAM_TS_MS = 2000;
+    // Give slack time for waiting UDP stream mode because handling conntrack event in user space
+    // may not in precise time. Used to reduce the flaky rate.
+    private static final int UDP_STREAM_SLACK_MS = 500;
     // Per RX UDP packet size: iphdr (20) + udphdr (8) + payload (2) = 30 bytes.
     private static final int RX_UDP_PACKET_SIZE = 30;
     private static final int RX_UDP_PACKET_COUNT = 456;
@@ -1171,6 +1174,9 @@
             Thread.sleep(UDP_STREAM_TS_MS);
             sendUploadPacketUdp(srcMac, dstMac, clientIp, remoteIp, tester, false /* is4To6 */);
 
+            // Give a slack time for handling conntrack event in user space.
+            Thread.sleep(UDP_STREAM_SLACK_MS);
+
             // [1] Verify IPv4 upstream rule map.
             final HashMap<Tether4Key, Tether4Value> upstreamMap = pollRawMapFromDump(
                     Tether4Key.class, Tether4Value.class, DUMPSYS_RAWMAP_ARG_UPSTREAM4);