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-rw-r--r--src/newgrf_spritegroup.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/newgrf_spritegroup.h b/src/newgrf_spritegroup.h
index e91846097..f1b17cbbe 100644
--- a/src/newgrf_spritegroup.h
+++ b/src/newgrf_spritegroup.h
@@ -243,7 +243,7 @@ struct ResolverObject {
/* Base sprite group resolver */
-const SpriteGroup *Resolve(const SpriteGroup *group, ResolverObject *object);
+const SpriteGroup *Resolve(const SpriteGroup *group, ResolverObject *object, bool first_call = true);
#endif /* NEWGRF_SPRITEGROUP_H */