diff --git a/pkgs/development/tools/postiats-utilities/default.nix b/pkgs/development/tools/postiats-utilities/default.nix
index 6d4db28f37e0..f65d96382ac0 100644
--- a/pkgs/development/tools/postiats-utilities/default.nix
+++ b/pkgs/development/tools/postiats-utilities/default.nix
@@ -19,8 +19,6 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ python3 python3Packages.wrapPython ];
 
-  phases = "unpackPhase patchPhase installPhase";
-
   postPatch = ''
     for f in pats-* postiats/*.py; do
       sed -i "$f" -e "1 s,python3,python,"