diff --git a/src/base/base_arena.c b/src/base/base_arena.c
index d6a6f3d5..d9bb1674 100644
--- a/src/base/base_arena.c
+++ b/src/base/base_arena.c
@@ -118,12 +118,12 @@ arena_push(Arena *arena, U64 size, U64 align)
       U64 cmt_size = current->cmt_size;
       if(size + ARENA_HEADER_SIZE > res_size)
       {
-        res_size = size + ARENA_HEADER_SIZE;
-        cmt_size = size + ARENA_HEADER_SIZE;
+        res_size = AlignPow2(size + ARENA_HEADER_SIZE, align);
+        cmt_size = AlignPow2(size + ARENA_HEADER_SIZE, align);
       }
       new_block = arena_alloc(.reserve_size = res_size,
-                              .commit_size = cmt_size,
-                              .flags = current->flags);
+                              .commit_size  = cmt_size,
+                              .flags        = current->flags);
       new_block->base_pos = current->base_pos + current->res;
       SLLStackPush_N(arena->current, new_block, prev);
     }