diff --git a/src/pbs.h b/src/pbs.h
--- a/src/pbs.h
+++ b/src/pbs.h
@@ -55,7 +55,7 @@ Train *GetTrainForReservation(TileIndex 
  * @param tracks the tracks to test
  * @return true if at least on of tracks is reserved
  */
-static inline bool HasReservedTracks(TileIndex tile, TrackBits tracks)
+inline bool HasReservedTracks(TileIndex tile, TrackBits tracks)
 {
 	return (GetReservedTrackbits(tile) & tracks) != TRACK_BIT_NONE;
 }