diff --git a/appveyor.yml b/appveyor.yml
index c1d1b9ad9..9ee8eda76 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -9,8 +9,6 @@ branches:
   only:
     - master
 
-os: Windows Server 2012 R2
-
 environment:
   GOPATH: c:\gopath
   CYG_MIRROR: http://cygwin.mirror.constant.com