diff --git a/web/ons-demo/js/iperf.js b/web/ons-demo/js/iperf.js
index b74175c..b1f964c 100644
--- a/web/ons-demo/js/iperf.js
+++ b/web/ons-demo/js/iperf.js
@@ -185,6 +185,6 @@
 		}
 
 		// wait a buffer to make sure the old iperf session gets cleared out
-		setTimeout(fetchData, updateRate);
+		flow.iperfFetchTimeout = setTimeout(fetchData, updateRate);
 	}
 }
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