diff --git a/common.nix b/common.nix
index 8585637..2f77381 100644
--- a/common.nix
+++ b/common.nix
@@ -128,9 +128,6 @@
       extraPythonPackages = [ pkgs.pythonPackages.websocket_client ];
     };
 
-    # remove with khal 0.9.0
-    khal = khal.overrideDerivation (oldAttrs: { checkPhase = ""; installCheckPhase = "true"; });
-
     stable = stable;
   };