diff --git a/lib/sendf.c b/lib/sendf.c
index 8886b83725..9ec40adc6d 100644
--- a/lib/sendf.c
+++ b/lib/sendf.c
@@ -550,7 +550,7 @@ int Curl_read(struct connectdata *conn, /* connection data */
       conn->read_pos = nread;
     }
 
-    *n = nread;
+    *n += nread;
   }
 
   return CURLE_OK;