diff --git a/sanic/server.py b/sanic/server.py
index 93e3322a..baacc10b 100644
--- a/sanic/server.py
+++ b/sanic/server.py
@@ -110,7 +110,10 @@ class HttpProtocol(asyncio.Protocol):
         )
 
     def on_body(self, body):
-        self.request.body = body
+        if self.request.body:
+            self.request.body += body
+        else:
+            self.request.body = body
 
     def on_message_complete(self):
         self.loop.create_task(