diff --git a/include/arena.h b/include/arena.h
index 6bfd19a..2fd778b 100644
--- a/include/arena.h
+++ b/include/arena.h
@@ -57,7 +57,7 @@ ArenaPointer arena_push(Arena *arena, void *data, size_t size, size_t alignment)
 ArenaErr arena_realloc(Arena *arena, size_t new_capacity);
 void *arena_unwrap_pointer(ArenaPointer p);
 
-SizeResult arena_get_align_padding(Arena *arena, size_t alignment);
+ArenaSizeResult arena_get_align_padding(Arena *arena, size_t alignment);
 // can take big sizes but of sourse there is a limit,
 // its protected against SIZE_MAX but anything that
 // is big may break it, still, is an edge case that