diff --git a/src/arena.c b/src/arena.c
index 6a15c83d..c56c7b8e 100644
--- a/src/arena.c
+++ b/src/arena.c
@@ -69,10 +69,10 @@ typedef struct mi_arena_s {
   bool     is_zero_init;                  // is the arena zero initialized?
   bool     is_committed;                  // is the memory committed
   bool     is_large;                      // large OS page allocated
-  _Atomic(uintptr_t) search_idx; // optimization to start the search for free blocks
+  _Atomic(uintptr_t) search_idx;          // optimization to start the search for free blocks
   mi_bitmap_field_t* blocks_dirty;        // are the blocks potentially non-zero?
   mi_bitmap_field_t* blocks_committed;    // if `!is_committed`, are the blocks committed?
-  mi_bitmap_field_t  blocks_inuse[1];       // in-place bitmap of in-use blocks (of size `field_count`)
+  mi_bitmap_field_t  blocks_inuse[1];     // in-place bitmap of in-use blocks (of size `field_count`)
 } mi_arena_t;