diff --git a/pkgs/tools/X11/xpra/libfakeXinerama.nix b/pkgs/tools/X11/xpra/libfakeXinerama.nix
index da5be29cae1..e43043d78f2 100644
--- a/pkgs/tools/X11/xpra/libfakeXinerama.nix
+++ b/pkgs/tools/X11/xpra/libfakeXinerama.nix
@@ -11,8 +11,6 @@ stdenv.mkDerivation  rec {
 
   buildInputs = [ libX11 libXinerama ];
 
-  phases = [ "unpackPhase" "buildPhase" "installPhase" ];
-
   buildPhase = ''
     gcc -O2 -Wall fakeXinerama.c -fPIC -o libfakeXinerama.so.1.0 -shared
   '';