diff --git a/src/newgrf_airport.cpp b/src/newgrf_airport.cpp
--- a/src/newgrf_airport.cpp
+++ b/src/newgrf_airport.cpp
@@ -20,8 +20,8 @@
 
 static AirportClass _airport_classes[APC_MAX];
 
-AirportSpec AirportSpec::dummy = {NULL, NULL, 0, 0, 0, 0, 0, MIN_YEAR, MIN_YEAR, ATP_TTDP_LARGE, APC_BEGIN};
-AirportSpec AirportSpec::oilrig = {NULL, NULL, 0, 1, 1, 0, 4, MIN_YEAR, MIN_YEAR, ATP_TTDP_OILRIG, APC_BEGIN};
+AirportSpec AirportSpec::dummy = {NULL, NULL, 0, 0, 0, 0, 0, MIN_YEAR, MIN_YEAR, STR_NULL, ATP_TTDP_LARGE, APC_BEGIN};
+AirportSpec AirportSpec::oilrig = {NULL, NULL, 0, 1, 1, 0, 4, MIN_YEAR, MIN_YEAR, STR_NULL, ATP_TTDP_OILRIG, APC_BEGIN};
 
 AirportSpec AirportSpec::specs[NUM_AIRPORTS];