diff --git a/support/testing/tests/package/test_mosquitto.py b/support/testing/tests/package/test_mosquitto.py
index ba10b30b00b5..6b256e5e27f0 100644
--- a/support/testing/tests/package/test_mosquitto.py
+++ b/support/testing/tests/package/test_mosquitto.py
@@ -25,13 +25,19 @@ def test_run(self):
         msg = "Hello Buildroot!"
 
         # We subscribe to a topic and write one message to a log file.
-        self.assertRunOk(f"mosquitto_sub -t {topic} -C 1 > {log} &")
+        cmd = f"( mosquitto_sub -t {topic} -C 1 > {log} 2> /dev/null & )"
+        self.assertRunOk(cmd)
 
-        time.sleep(1)
+        # We give some time to the subscriber process to settle.
+        time.sleep(5)
 
         # We publish a message.
         self.assertRunOk(f"mosquitto_pub -t {topic} -m '{msg}'")
 
+        # We give some more time to the subscriber process to write
+        # the log and quit.
+        time.sleep(5)
+
         # We check the log file contains our message.
         out, ret = self.emulator.run(f"cat {log}")
         self.assertEqual(ret, 0)