diff --git a/src/shared/ByteBuffer.h b/src/shared/ByteBuffer.h
index d89af2ebcb..99b364f965 100644
--- a/src/shared/ByteBuffer.h
+++ b/src/shared/ByteBuffer.h
@@ -399,7 +399,7 @@ class ByteBuffer
 
         void append(const ByteBuffer& buffer)
         {
-            if(buffer.wpos())
+            if(buffer.size())
                 append(buffer.contents(), buffer.wpos());
         }