diff --git a/testing/btest/Files/zeromq/single-node.zeek b/testing/btest/Files/zeromq/single-node.zeek
new file mode 100644
index 0000000000..af604e54dc
--- /dev/null
+++ b/testing/btest/Files/zeromq/single-node.zeek
@@ -0,0 +1,24 @@
+# Helper script expecting XPUB_PORT / XSUB_PORT environments
+# and redefining the ZeroMQ options accordingly and starting
+# the zmq_proxy_thread.
+#
+# This is primarily useful for testing of WebSocket functionality
+# while the ZeroMQ backend is enabled.
+@load base/utils/numbers
+
+@load frameworks/cluster/backend/zeromq
+
+const local_addr_str = "127.0.0.1" &redef;
+redef Cluster::Backend::ZeroMQ::listen_xpub_endpoint = fmt("tcp://%s:%s", local_addr_str, port_to_count(to_port(getenv("XPUB_PORT"))));
+redef Cluster::Backend::ZeroMQ::listen_xsub_endpoint = fmt("tcp://%s:%s", local_addr_str, port_to_count(to_port(getenv("XSUB_PORT"))));
+redef Cluster::Backend::ZeroMQ::connect_xpub_endpoint = fmt("tcp://%s:%s", local_addr_str, port_to_count(to_port(getenv("XSUB_PORT"))));
+redef Cluster::Backend::ZeroMQ::connect_xsub_endpoint = fmt("tcp://%s:%s", local_addr_str, port_to_count(to_port(getenv("XPUB_PORT"))));
+
+event zeek_init() &priority=100
+	{
+	if ( ! Cluster::Backend::ZeroMQ::spawn_zmq_proxy_thread() )
+		Reporter::fatal("Failed to spawn ZeroMQ proxy thread");
+
+	if ( ! Cluster::init() )
+		Reporter::fatal("Failed to initialize ZeroMQ backend");
+	}
diff --git a/testing/btest/cluster/websocket/terminate-while-queuing.zeek b/testing/btest/cluster/websocket/terminate-while-queuing.zeek
index 787f02671a..510f09a455 100644
--- a/testing/btest/cluster/websocket/terminate-while-queuing.zeek
+++ b/testing/btest/cluster/websocket/terminate-while-queuing.zeek
@@ -2,9 +2,13 @@
 #
 # @TEST-REQUIRES: python3 -c 'import websockets.sync'
 #
+# @TEST-PORT: XPUB_PORT
+# @TEST-PORT: XSUB_PORT
 # @TEST-PORT: WEBSOCKET_PORT
 #
+# @TEST-EXEC: cp $FILES/zeromq/single-node.zeek zeromq-single-node.zeek
 # @TEST-EXEC: cp $FILES/ws/wstest.py .
+#
 # @TEST-EXEC: zeek -b --parse-only manager.zeek
 # @TEST-EXEC: python3 -m py_compile client.py
 #
@@ -19,6 +23,8 @@
 # @TEST-EXEC: btest-diff ./client/.stderr
 
 # @TEST-START-FILE manager.zeek
+@load zeromq-single-node
+
 redef exit_only_after_terminate = T;
 
 # Force dispatcher queue being full quickly!