diff --git a/lib/net/protocol.rb b/lib/net/protocol.rb
index 7e42d22..3fb55b0 100644
--- a/lib/net/protocol.rb
+++ b/lib/net/protocol.rb
@@ -171,7 +171,7 @@ def inspect
     end
 
     def eof?
-      @io.eof?
+      @rbuf_empty && @io.eof?
     end
 
     def closed?