diff --git a/ouster-ros/src/os_pcap_node.cpp b/ouster-ros/src/os_pcap_node.cpp
index dfe8a5be..7e856b9d 100644
--- a/ouster-ros/src/os_pcap_node.cpp
+++ b/ouster-ros/src/os_pcap_node.cpp
@@ -302,7 +302,7 @@ class OusterPcap : public OusterSensorNodeBase {
                 std::cout << "unknown packet" << std::endl;
                 RCLCPP_WARN_STREAM_THROTTLE(
                     get_logger(), *get_clock(), 1,
-                    "unknown packet /w port" << packet_info.dst_port);
+                    "unknown packet /w port: " << packet_info.dst_port);
             }
             auto prev_packet_ts = packet_info.timestamp;
             payload_size = pcap.next_packet();