diff --git a/src/osmo_gsm_tester/iperf3.py b/src/osmo_gsm_tester/iperf3.py
index d0cf806f..8f0cddbe 100644
--- a/src/osmo_gsm_tester/iperf3.py
+++ b/src/osmo_gsm_tester/iperf3.py
@@ -76,6 +76,9 @@ class IPerf3Server(log.Origin):
     def port(self):
         return self._port
 
+    def __str__(self):
+        return "%s:%u" %(self.addr(), self.port())
+
     def running(self):
         return not self.process.terminated()