diff --git a/bin/tests/system/dlzexternal/prereq.sh b/bin/tests/system/dlzexternal/prereq.sh
new file mode 100644
index 0000000000..6067aeb548
--- /dev/null
+++ b/bin/tests/system/dlzexternal/prereq.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+#
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# 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 http://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+. ../conf.sh
+
+$FEATURETEST --tsan && {
+	echo_i "TSAN - skipping dlzexternal test"
+        exit 255
+}
+
+exit 0
diff --git a/bin/tests/system/dyndb/prereq.sh b/bin/tests/system/dyndb/prereq.sh
new file mode 100644
index 0000000000..7f17ef8854
--- /dev/null
+++ b/bin/tests/system/dyndb/prereq.sh
@@ -0,0 +1,17 @@
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+. ../conf.sh
+
+$FEATURETEST --tsan &&  {
+        echo_i "TSAN - skipping dyndb test"
+        exit 255
+}
+
+exit 0
diff --git a/bin/tests/system/feature-test.c b/bin/tests/system/feature-test.c
index 3b772968b9..88e6c91c5a 100644
--- a/bin/tests/system/feature-test.c
+++ b/bin/tests/system/feature-test.c
@@ -43,6 +43,7 @@ usage(void) {
 	fprintf(stderr, "\t--have-geoip2\n");
 	fprintf(stderr, "\t--have-libxml2\n");
 	fprintf(stderr, "\t--ipv6only=no\n");
+	fprintf(stderr, "\t--tsan\n");
 	fprintf(stderr, "\t--with-dlz-filesystem\n");
 	fprintf(stderr, "\t--with-idn\n");
 	fprintf(stderr, "\t--with-lmdb\n");
@@ -125,6 +126,19 @@ main(int argc, char **argv) {
 #endif /* ifdef HAVE_LIBXML2 */
 	}
 
+	if (strcmp(argv[1], "--tsan") == 0) {
+#if defined(__has_feature)
+#if __has_feature(thread_sanitizer)
+		return (0);
+#endif
+#endif
+#if __SANITIZE_THREAD__
+		return (0);
+#else
+		return (1);
+#endif
+	}
+
 	if (strcmp(argv[1], "--ipv6only=no") == 0) {
 #ifdef WIN32
 		return (0);
diff --git a/util/copyrights b/util/copyrights
index b27720e05a..73f8c06aec 100644
--- a/util/copyrights
+++ b/util/copyrights
@@ -326,6 +326,7 @@
 ./bin/tests/system/dlzexternal/clean.sh		SH	2010,2012,2014,2015,2016,2018,2019,2020
 ./bin/tests/system/dlzexternal/driver/driver.c	C	2011,2012,2013,2014,2015,2016,2017,2018,2019,2020
 ./bin/tests/system/dlzexternal/driver/driver.h	C	2011,2016,2018,2019,2020
+./bin/tests/system/dlzexternal/prereq.sh	SH	2020
 ./bin/tests/system/dlzexternal/setup.sh		SH	2010,2012,2014,2016,2017,2018,2019,2020
 ./bin/tests/system/dlzexternal/tests.sh		SH	2010,2011,2012,2013,2014,2015,2016,2018,2019,2020
 ./bin/tests/system/dns64/clean.sh		SH	2010,2012,2014,2015,2016,2018,2019,2020
@@ -400,6 +401,7 @@
 ./bin/tests/system/dyndb/driver/util.h		X	2015,2018,2019,2020
 ./bin/tests/system/dyndb/driver/zone.c		X	2015,2018,2019,2020
 ./bin/tests/system/dyndb/driver/zone.h		X	2015,2018,2019,2020
+./bin/tests/system/dyndb/prereq.sh		SH	2020
 ./bin/tests/system/dyndb/setup.sh		SH	2018,2019,2020
 ./bin/tests/system/dyndb/tests.sh		SH	2015,2016,2018,2019,2020
 ./bin/tests/system/ecdsa/clean.sh		SH	2012,2014,2016,2018,2019,2020