diff --git a/testing/btest/Baseline/scripts.base.protocols.http.version-mismatch/http.log b/testing/btest/Baseline/scripts.base.protocols.http.version-mismatch/http.log
new file mode 100644
index 0000000000..23b43c9607
--- /dev/null
+++ b/testing/btest/Baseline/scripts.base.protocols.http.version-mismatch/http.log
@@ -0,0 +1,12 @@
+### 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	http
+#open XXXX-XX-XX-XX-XX-XX
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	trans_depth	method	host	uri	referrer	version	user_agent	origin	request_body_len	response_body_len	status_code	status_msg	info_code	info_msg	tags	username	password	proxied	orig_fuids	orig_filenames	orig_mime_types	resp_fuids	resp_filenames	resp_mime_types
+#types	time	string	addr	port	addr	port	count	string	string	string	string	string	string	string	count	count	count	string	count	string	set[enum]	string	string	set[string]	vector[string]	vector[string]	vector[string]	vector[string]	vector[string]	vector[string]
+XXXXXXXXXX.XXXXXX	CHhAvVGS1DHFjwGM9	192.168.1.102	1482	74.201.118.102	80	1	GET	ad.afy11.net	/srad.js?azId=1000000326207	http://d3.zedo.com/jsc/d3/ff2.html?n=1073;c=1;s=1;d=7;w=160;h=600	1.1	Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5	-	0	12122	200	OK	-	-	(empty)	-	-	-	-	-	-	FdVLuk3tKSr7YHlidh	-	text/plain
+XXXXXXXXXX.XXXXXX	CHhAvVGS1DHFjwGM9	192.168.1.102	1482	74.201.118.102	80	2	GET	ad.afy11.net	/ad?asId=1000000326207&sd=2x160x600&ct=7&enc=1&sf=0&sfd=0&ynw=0&anw=1&rand=71014409&rk1=46812516&rk2=XXXXXXXXXX.XXXXXX&pt=0	http://d3.zedo.com/jsc/d3/ff2.html?n=1073;c=1;s=1;d=7;w=160;h=600	1.0	Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5	-	0	1254	200	OK	-	-	(empty)	-	-	-	-	-	-	F5aMef27icyTRBKeQa	-	application/javascript
+#close XXXX-XX-XX-XX-XX-XX
diff --git a/testing/btest/Baseline/scripts.base.protocols.http.version-mismatch/weird.log b/testing/btest/Baseline/scripts.base.protocols.http.version-mismatch/weird.log
new file mode 100644
index 0000000000..7fa1fc9d70
--- /dev/null
+++ b/testing/btest/Baseline/scripts.base.protocols.http.version-mismatch/weird.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	weird
+#open XXXX-XX-XX-XX-XX-XX
+#fields	ts	uid	id.orig_h	id.orig_p	id.resp_h	id.resp_p	name	addl	notice	peer	source
+#types	time	string	addr	port	addr	port	string	string	bool	string	string
+XXXXXXXXXX.XXXXXX	CHhAvVGS1DHFjwGM9	192.168.1.102	1482	74.201.118.102	80	HTTP_version_mismatch	-	F	zeek	HTTP
+#close XXXX-XX-XX-XX-XX-XX
diff --git a/testing/btest/Traces/http/version-mismatch.pcap b/testing/btest/Traces/http/version-mismatch.pcap
new file mode 100644
index 0000000000..179e44f984
Binary files /dev/null and b/testing/btest/Traces/http/version-mismatch.pcap differ
diff --git a/testing/btest/scripts/base/protocols/http/version-mismatch.zeek b/testing/btest/scripts/base/protocols/http/version-mismatch.zeek
new file mode 100644
index 0000000000..9929122053
--- /dev/null
+++ b/testing/btest/scripts/base/protocols/http/version-mismatch.zeek
@@ -0,0 +1,7 @@
+# @TEST-DOC: Pcap extracted from 2009-M57-day11-18.trace: The server replies with HTTP/1.1, then HTTP/1.0 (also different Server headers).
+# @TEST-EXEC: zeek -b -Cr $TRACES/http/version-mismatch.pcap %INPUT
+# @TEST-EXEC: btest-diff http.log
+# @TEST-EXEC: btest-diff weird.log
+
+@load base/protocols/http
+@load base/frameworks/notice/weird