diff --git a/src/tunnelbridge.h b/src/tunnelbridge.h
--- a/src/tunnelbridge.h
+++ b/src/tunnelbridge.h
@@ -22,7 +22,7 @@ void MarkBridgeDirty(TileIndex tile);
  * @param end   The end of the tunnel or bridge.
  * @return length of bridge/tunnel middle
  */
-static inline uint GetTunnelBridgeLength(TileIndex begin, TileIndex end)
+inline uint GetTunnelBridgeLength(TileIndex begin, TileIndex end)
 {
 	int x1 = TileX(begin);
 	int y1 = TileY(begin);
@@ -38,7 +38,7 @@ static inline uint GetTunnelBridgeLength
  * @param end   The end of the tunnel or bridge.
  * @param owner The new owner to set
  */
-static inline void SetTunnelBridgeOwner(TileIndex begin, TileIndex end, Owner owner)
+inline void SetTunnelBridgeOwner(TileIndex begin, TileIndex end, Owner owner)
 {
 	SetTileOwner(begin, owner);
 	SetTileOwner(end, owner);