diff --git a/CHANGES b/CHANGES
index 3d8e5d4bc6..6943702656 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,9 @@
+4.2.0-dev.159 | 2021-09-14 13:00:50 -0700
+
+  * ignore_checksums_nets: Add test for multiple subnets (Arne Welzel, Corelight)
+
+    This test fails with Zeek 4.1 and Zeek 4.0.3.
+
 4.2.0-dev.157 | 2021-09-08 12:04:45 -0700
 
   * fix for looping over vectors with holes per https://github.com/zeek/zeek/issues/1763 (Vern Paxson, Corelight)
diff --git a/VERSION b/VERSION
index 6e49fb7671..21a84a9ebd 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.2.0-dev.157
+4.2.0-dev.159
diff --git a/testing/btest/Baseline/core.checksums_ignore_nets/conn-worked-multi-subnets.log b/testing/btest/Baseline/core.checksums_ignore_nets/conn-worked-multi-subnets.log
new file mode 100644
index 0000000000..9097cb30dd
--- /dev/null
+++ b/testing/btest/Baseline/core.checksums_ignore_nets/conn-worked-multi-subnets.log
@@ -0,0 +1,11 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+#separator \x09
+#set_separator	,
+#empty_field	(empty)
+#unset_field	-
+#path	conn
+#open XXXX-XX-XX-XX-XX-XX
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	proto	service	duration	orig_bytes	resp_bytes	conn_state	local_orig	local_resp	missed_bytes	history	orig_pkts	orig_ip_bytes	resp_pkts	resp_ip_bytes	tunnel_parents
+#types	time	string	addr	port	addr	port	enum	string	interval	count	count	string	bool	bool	count	string	count	count	count	count	set[string]
+XXXXXXXXXX.XXXXXX	CHhAvVGS1DHFjwGM9	192.168.1.28	53246	35.221.46.9	80	tcp	-	0.091969	74	432	SF	-	-	0	ShADadFf	6	338	4	604	-
+#close XXXX-XX-XX-XX-XX-XX
diff --git a/testing/btest/core/checksums_ignore_nets.test b/testing/btest/core/checksums_ignore_nets.test
index 89b21a502a..bc8d7cb733 100644
--- a/testing/btest/core/checksums_ignore_nets.test
+++ b/testing/btest/core/checksums_ignore_nets.test
@@ -1,7 +1,9 @@
 # @TEST-EXEC: zeek -b -r $TRACES/chksums/localhost-bad-chksum.pcap "ignore_checksums_nets += {192.168.0.0/16}" %INPUT && mv conn.log conn-worked.log
+# @TEST-EXEC: zeek -b -r $TRACES/chksums/localhost-bad-chksum.pcap "ignore_checksums_nets += {192.168.0.0/16, 192.169.0.0/16}" %INPUT && mv conn.log conn-worked-multi-subnets.log
 # @TEST-EXEC: zeek -b -r $TRACES/chksums/localhost-bad-chksum.pcap %INPUT && mv conn.log conn-failed.log
 
 # @TEST-EXEC: btest-diff conn-worked.log
+# @TEST-EXEC: btest-diff conn-worked-multi-subnets.log
 # @TEST-EXEC: btest-diff conn-failed.log
 
 @load base/protocols/conn