diff --git a/pkgs/applications/office/ib/tws/default.nix b/pkgs/applications/office/ib/tws/default.nix
index 24c8cafcdda5..3b267d79f39f 100644
--- a/pkgs/applications/office/ib/tws/default.nix
+++ b/pkgs/applications/office/ib/tws/default.nix
@@ -16,8 +16,6 @@ stdenv.mkDerivation rec {
     sha256 = "1a2jiwwnr5g3xfba1a89c257bdbnq4zglri8hz021vk7f6s4rlrf";
   };
 
-  phases = [ "unpackPhase" "buildPhase" "installPhase" ];
-
   buildInputs = [ jdk ];
 
   buildPhase = ''