diff --git a/regression-tests/12-rpl/06-rpl-temporary-root-loss.csc b/regression-tests/12-rpl/06-rpl-temporary-root-loss.csc
index 297ef0646..6884c9fc5 100644
--- a/regression-tests/12-rpl/06-rpl-temporary-root-loss.csc
+++ b/regression-tests/12-rpl/06-rpl-temporary-root-loss.csc
@@ -287,9 +287,14 @@ GENERATE_MSG(2000000, "add-sink");
 
 lostMsgs = 0;
 
-TIMEOUT(2000000, if(lostMsgs == 0) { log.testOK(); } );
+// we check that we got up to at least message 62 and
+// (the simulation is 4000000ms = 66 minutes long)
+// that we did not lose anything since 34
+// (the sink is back at 2000000ms = 33 minutes)
+TIMEOUT(4000000, if(lastMsg >= 62 && lastMissed <= 34) { log.testOK(); } );
 
 lastMsg = -1;
+lastMissed = -1;
 packets = "_________";
 hops = 0;
 
@@ -321,6 +326,7 @@ while(true) {
 //        log.log("Num " + num + "\n");
         if(lastMsg != -1) {
           if(num != lastMsg + 1) {
+            lastMissed = num;
             numMissed = num - lastMsg - 1;
             lostMsgs += numMissed;
             log.log("Missed messages " + numMissed + " before " + num + "\n");