diff --git a/src/arena-abandoned.c b/src/arena-abandon.c
similarity index 99%
rename from src/arena-abandoned.c
rename to src/arena-abandon.c
index 465a074d..eaa8c7c9 100644
--- a/src/arena-abandoned.c
+++ b/src/arena-abandon.c
@@ -13,8 +13,6 @@ terms of the MIT license. A copy of the license can be found in the file
 #include "bitmap.h"
 #endif
 
-typedef struct mi_arena_s mi_arena_t;
-
 // Minimal exports for arena-abandoned.
 size_t      mi_arena_id_index(mi_arena_id_t id);
 mi_arena_t* mi_arena_from_index(size_t idx);
diff --git a/src/arena.c b/src/arena.c
index 0bd58aaa..3bb8f502 100644
--- a/src/arena.c
+++ b/src/arena.c
@@ -62,7 +62,7 @@ static mi_decl_cache_align _Atomic(mi_arena_t*) mi_arenas[MI_MAX_ARENAS];
 static mi_decl_cache_align _Atomic(size_t)      mi_arena_count; // = 0
 
 #define MI_IN_ARENA_C
-#include "arena-abandoned.c"
+#include "arena-abandon.c"
 #undef MI_IN_ARENA_C
 
 /* -----------------------------------------------------------