diff --git a/acts/tests/google/wifi/WifiStressTest.py b/acts/tests/google/wifi/WifiStressTest.py
index 1cacf45..d4d617f 100755
--- a/acts/tests/google/wifi/WifiStressTest.py
+++ b/acts/tests/google/wifi/WifiStressTest.py
@@ -331,7 +331,8 @@
            Steps:
                1. Scan and connect to a network.
                2. Run IPerf to download data for few hours.
-               3. Verify no WiFi disconnects/data interruption.
+               3. Run IPerf to upload data for few hours.
+               4. Verify no WiFi disconnects/data interruption.
 
         """
         try:
@@ -348,6 +349,15 @@
                 self.log.debug("Error occurred in iPerf traffic.")
                 start_time = time.time()
                 self.run_ping(sec)
+            # Start IPerf traffic from phone to server.
+            # Upload data for 5 hours.
+            args = "-p {} -t {}".format(self.iperf_server.port, sec)
+            self.log.info("Running iperf client {}".format(args))
+            result, data = self.dut.run_iperf_client(self.iperf_server_address,
+                args, timeout=sec+1)
+            if not result:
+                self.log.debug("Error occurred in iPerf traffic.")
+                self.run_ping(sec)
         except:
             total_time = time.time() - start_time
             raise signals.TestFailure("Network long-connect failed."