diff --git a/a8/orderbuffer.cc b/a8/orderbuffer.cc
index 599f26d..f78fb9c 100644
--- a/a8/orderbuffer.cc
+++ b/a8/orderbuffer.cc
@@ -7,12 +7,18 @@ namespace a8
 
     OrderBuffer::OrderBuffer(int buf_len)
     {
-
+        if (buf_len <= 0) {
+            abort();
+        }
+        buf_ = (char*)malloc(buf_len);
+        buf_len_ = buf_len;
     }
 
     OrderBuffer::~OrderBuffer()
     {
-
+        free(buf_);
+        buf_ = nullptr;
+        buf_len_ = 0;
     }
 
     char* OrderBuffer::Alloc(int len)