diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 8e90405cd2e..dee8007b4b6 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -1034,6 +1034,7 @@ in {
 
       homepage = https://github.com/skarra/CalDAVClientLibrary/tree/asynkdev/;
       maintainers = with maintainers; [ pjones ];
+      broken = true; # 2018-04-11
     };
   };