diff --git a/bin/tests/system/nsupdate/tests.sh b/bin/tests/system/nsupdate/tests.sh
index 177fa9bedb..b0cc0d0894 100644
--- a/bin/tests/system/nsupdate/tests.sh
+++ b/bin/tests/system/nsupdate/tests.sh
@@ -15,7 +15,7 @@
 # OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 # PERFORMANCE OF THIS SOFTWARE.
 
-# $Id: tests.sh,v 1.39 2011/06/09 00:15:05 each Exp $
+# $Id: tests.sh,v 1.40 2011/06/21 22:15:05 each Exp $
 
 SYSTEMTESTTOP=..
 . $SYSTEMTESTTOP/conf.sh
@@ -205,6 +205,18 @@ then
         status=1
 fi
 
+n=`expr $n + 1`
+echo "I:check that update to undefined class is handled ($n)"
+echo "a0e4280000010001000000000000060101c00c000000fe000000000000" |
+$PERL ../packet.pl -a 10.53.0.1 -p 5300 -t tcp > /dev/null
+$DIG +tcp version.bind txt ch @10.53.0.1 -p 5300 > dig.out.ns1.$n
+grep "status: NOERROR" dig.out.ns1.$n > /dev/null || ret=1
+if test $ret -ne 0
+then
+	echo "I:failed"
+        status=1
+fi
+
 if $PERL -e 'use Net::DNS;' 2>/dev/null
 then
     echo "I:running update.pl test"