diff --git a/bin/tests/system/tsiggss/clean.sh b/bin/tests/system/tsiggss/clean.sh
index d1d3a3088c..a7e44c14b1 100644
--- a/bin/tests/system/tsiggss/clean.sh
+++ b/bin/tests/system/tsiggss/clean.sh
@@ -24,3 +24,4 @@ rm -f ns1/_default.tsigkeys
 rm -f */named.memstats
 rm -f authsock.pid
 rm -f ns1/core
+rm -f nsupdate.out