diff --git a/src/elrail_func.h b/src/elrail_func.h
--- a/src/elrail_func.h
+++ b/src/elrail_func.h
@@ -18,7 +18,7 @@
  * Test if a rail type has catenary
  * @param rt Rail type to test
  */
-static inline bool HasRailCatenary(RailType rt)
+inline bool HasRailCatenary(RailType rt)
 {
 	return HasBit(GetRailTypeInfo(rt)->flags, RTF_CATENARY);
 }
@@ -27,7 +27,7 @@ static inline bool HasRailCatenary(RailT
  * Test if we should draw rail catenary
  * @param rt Rail type to test
  */
-static inline bool HasRailCatenaryDrawn(RailType rt)
+inline bool HasRailCatenaryDrawn(RailType rt)
 {
 	return HasRailCatenary(rt) && !IsInvisibilitySet(TO_CATENARY) && !_settings_game.vehicle.disable_elrails;
 }