diff --git a/ros2_foxglove_bridge/src/ros2_foxglove_bridge.cpp b/ros2_foxglove_bridge/src/ros2_foxglove_bridge.cpp
index 1e37963..1e429e8 100644
--- a/ros2_foxglove_bridge/src/ros2_foxglove_bridge.cpp
+++ b/ros2_foxglove_bridge/src/ros2_foxglove_bridge.cpp
@@ -480,7 +480,7 @@ void FoxgloveBridge::subscribe(foxglove::ChannelId channelId, ConnectionHandle c
     // broadcasters). See also
     // https://github.com/foxglove/ros-foxglove-bridge/issues/238 and
     // https://github.com/foxglove/ros-foxglove-bridge/issues/208
-    const size_t publisherHistoryDepth = std::max(1ul, qos.depth());
+    const size_t publisherHistoryDepth = std::max(static_cast<size_t>(1), qos.depth());
     depth = depth + publisherHistoryDepth;
   }