diff --git a/pkgs/games/vessel/default.nix b/pkgs/games/vessel/default.nix
index 0aad0143aa60..353f05a157d1 100644
--- a/pkgs/games/vessel/default.nix
+++ b/pkgs/games/vessel/default.nix
@@ -29,7 +29,6 @@ stdenv.mkDerivation rec {
     else
       throw "unsupported platform ${stdenv.hostPlatform.system} only i686-linux supported for now.";
 
-  phases = "installPhase";
   ld_preload = ./isatty.c;
 
   libPath =
@@ -44,7 +43,7 @@ stdenv.mkDerivation rec {
       alsa-lib
     ];
 
-  installPhase = ''
+  buildCommand = ''
     mkdir -p $out/libexec/strangeloop/vessel/
     mkdir -p $out/bin