diff --git a/src/newgrf_airport.cpp b/src/newgrf_airport.cpp
--- a/src/newgrf_airport.cpp
+++ b/src/newgrf_airport.cpp
@@ -207,7 +207,7 @@ static void NewAirportResolver(ResolverO
 	res->count           = 0;
 
 	const AirportSpec *as = AirportSpec::Get(airport_id);
-	res->grffile = (as != NULL ? as->grf_prop.grffile : NULL);
+	res->grffile         = as->grf_prop.grffile;
 }
 
 SpriteID GetCustomAirportSprite(const AirportSpec *as, byte layout)