diff --git a/bin/tests/system/engine_pkcs11/2037-pk11_numbits-crash-test.pkt b/bin/tests/system/engine_pkcs11/2037-pk11_numbits-crash-test.pkt
new file mode 100644
index 0000000000..b9c5a32ade
--- /dev/null
+++ b/bin/tests/system/engine_pkcs11/2037-pk11_numbits-crash-test.pkt
@@ -0,0 +1,30 @@
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# SPDX-License-Identifier: MPL-2.0
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0.  If a copy of the MPL was not distributed with this
+# file, you can obtain one at https://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+edda 2800 0001 0000 0001 0000 0972 7361
+7368 6132 3536 0765 7861 6d70 6c65 0000
+0600 01c0 0c00 3000 0100 0001 2c01 0801
+0003 0803 0100 0100 0000 0000 0000 0000
+0000 0000 0000 0000 0000 0000 0000 0000
+0000 0000 0000 0000 0000 0000 0000 0000
+0000 0000 0000 0000 0000 0000 0000 0000
+0000 0000 0000 0000 0000 0000 0000 0000
+0000 0000 0000 0000 0000 0000 0000 0000
+0000 0000 0000 0000 0000 0000 0000 0000
+0000 0000 0000 0000 0000 0000 0000 0000
+0000 0000 0000 0000 0000 0000 0000 0000
+0000 0000 0000 0000 0000 0000 0000 0000
+0000 0000 0000 0000 0000 0000 0000 0000
+0000 0000 0000 0000 0000 0000 0000 0000
+0000 0000 0000 0000 0000 0000 0000 0000
+0000 0000 0000 0000 0000 0000 0000 0000
+0000 0000 0000 0000 0000 0000 0000 0000
+0000 0000 0000 0000 0000 0000 0000 0000
+0000 0000 0000 00
diff --git a/bin/tests/system/engine_pkcs11/tests.sh b/bin/tests/system/engine_pkcs11/tests.sh
index b97c60b69f..256ae2eef3 100644
--- a/bin/tests/system/engine_pkcs11/tests.sh
+++ b/bin/tests/system/engine_pkcs11/tests.sh
@@ -162,7 +162,13 @@ done
 # Go back to main test dir.
 cd ..
 
-# TODO: Checking for assertion failure in pk11_numbits
+n=$((n+1))
+ret=0
+echo_i "Checking for assertion failure in pk11_numbits()"
+$PERL ../packet.pl -a "10.53.0.1" -p "$PORT" -t udp 2037-pk11_numbits-crash-test.pkt
+dig_with_opts @10.53.0.1 version.bind. CH TXT > dig.out.pk11_numbits || ret=1
+test "$ret" -eq 0 || echo_i "failed"
+status=$((status+ret))
 
 echo_i "exit status: $status"
 [ $status -eq 0 ] || exit 1