diff --git a/src/core/mem/arena/mem_arena.c b/src/core/mem/arena/mem_arena.c
index 21856c3..ddac6a8 100644
--- a/src/core/mem/arena/mem_arena.c
+++ b/src/core/mem/arena/mem_arena.c
@@ -36,7 +36,11 @@ bool wapp_mem_arena_init_custom(Arena **arena, u64 base_capacity, MemAllocFlags
     return false;
   }
 
-  u64 arena_capacity = base_capacity >= ARENA_MINIMUM_CAPACITY ? base_capacity : ARENA_MINIMUM_CAPACITY;
+  u64 arena_capacity = wapp_misc_utils_u64_round_up_pow2(
+      base_capacity >= ARENA_MINIMUM_CAPACITY ?
+      base_capacity :
+      ARENA_MINIMUM_CAPACITY
+  );
 
   arena_ptr->buf = (u8 *)wapp_mem_util_alloc(NULL, arena_capacity, WAPP_MEM_ACCESS_READ_WRITE, flags,
                                              zero_buffer ? WAPP_MEM_INIT_INITIALISED : WAPP_MEM_INIT_UNINITIALISED);