diff --git a/ci/tsan_suppressions.txt b/ci/tsan_suppressions.txt
index ded78d13ac..7490adda94 100644
--- a/ci/tsan_suppressions.txt
+++ b/ci/tsan_suppressions.txt
@@ -42,3 +42,7 @@ race:zeek::threading::InputMessage<zeek::threading::MsgThread>::Object
 mutex:zeek::threading::Queue<zeek::threading::BasicInputMessage*>::Put
 mutex:zeek::threading::Queue<zeek::threading::BasicInputMessage*>::LocksForAllQueues
 deadlock:zeek::threading::Queue<zeek::threading::BasicInputMessage*>::LocksForAllQueues
+
+# This only happens at shutdown. It was supposedly fixed in civetweb, but has cropped
+# up again. See https://github.com/civetweb/civetweb/issues/861 for details.
+race:mg_stop