diff --git a/src/station_cmd.cpp b/src/station_cmd.cpp
index 59598b4368..0a6ff25527 100644
--- a/src/station_cmd.cpp
+++ b/src/station_cmd.cpp
@@ -92,7 +92,8 @@ RoadStop* GetRoadStopByTile(TileIndex tile, RoadStop::Type type)
 	return rs;
 }
 
-uint GetNumRoadStopsInStation(const Station* st, RoadStop::Type type)
+
+static uint GetNumRoadStopsInStation(const Station* st, RoadStop::Type type)
 {
 	uint num = 0;
 	const RoadStop *rs;