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-rw-r--r--src/newgrf_railtype.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/newgrf_railtype.h b/src/newgrf_railtype.h
index 829c166cb..ddcbd71ae 100644
--- a/src/newgrf_railtype.h
+++ b/src/newgrf_railtype.h
@@ -53,7 +53,7 @@ struct RailTypeResolverObject : public ResolverObject {
const SpriteGroup *ResolveReal(const RealSpriteGroup *group) const override;
};
-SpriteID GetCustomRailSprite(const RailtypeInfo *rti, TileIndex tile, RailTypeSpriteGroup rtsg, TileContext context = TCX_NORMAL, uint *num_results = NULL);
+SpriteID GetCustomRailSprite(const RailtypeInfo *rti, TileIndex tile, RailTypeSpriteGroup rtsg, TileContext context = TCX_NORMAL, uint *num_results = nullptr);
SpriteID GetCustomSignalSprite(const RailtypeInfo *rti, TileIndex tile, SignalType type, SignalVariant var, SignalState state, bool gui = false);
uint8 GetReverseRailTypeTranslation(RailType railtype, const GRFFile *grffile);