diff --git a/src/newgrf_cargo.h b/src/newgrf_cargo.h
--- a/src/newgrf_cargo.h
+++ b/src/newgrf_cargo.h
@@ -52,9 +52,9 @@ enum GlobalCargo {
 	NUM_GLOBAL_CID  =  32
 };
 
-VARDEF const CargoID _global_cargo_id[NUM_LANDSCAPE][NUM_CARGO];
-VARDEF const uint32 _landscape_global_cargo_mask[NUM_LANDSCAPE];
-VARDEF const CargoID _local_cargo_id_ctype[NUM_GLOBAL_CID];
-VARDEF const uint32 cargo_classes[16];
+extern const CargoID _global_cargo_id[NUM_LANDSCAPE][NUM_CARGO];
+extern const uint32 _landscape_global_cargo_mask[NUM_LANDSCAPE];
+extern const CargoID _local_cargo_id_ctype[NUM_GLOBAL_CID];
+extern const uint32 cargo_classes[16];
 
 #endif /* NEWGRF_CARGO_H */