diff --git a/bin/tests/system/catz/setup.sh b/bin/tests/system/catz/setup.sh
index 02fc258c08..faa9fbec5c 100644
--- a/bin/tests/system/catz/setup.sh
+++ b/bin/tests/system/catz/setup.sh
@@ -9,6 +9,8 @@
 SYSTEMTESTTOP=..
 . $SYSTEMTESTTOP/conf.sh
 
+$SHELL clean.sh
+
 copy_setports ns1/named.conf.in ns1/named.conf
 copy_setports ns2/named.conf.in ns2/named.conf
 copy_setports ns3/named.conf.in ns3/named.conf