diff --git a/alloc.d b/alloc.d
index 2cf423d..0261fc0 100644
--- a/alloc.d
+++ b/alloc.d
@@ -82,7 +82,7 @@ CreateArena(u64 size)
 void
 AddArenaPool(Arena* arena)
 {
-	u8* mem = cast(u8*)MemAlloc(size);
+	u8* mem = cast(u8*)MemAlloc(arena.length);
 
 	Node!(ArenaPool)* node = cast(Node!(ArenaPool)*)mem;