diff --git a/pkgs/applications/version-management/cvsps/default.nix b/pkgs/applications/version-management/cvsps/default.nix
index c1c28761a2a..aa3bcb27394 100644
--- a/pkgs/applications/version-management/cvsps/default.nix
+++ b/pkgs/applications/version-management/cvsps/default.nix
@@ -44,7 +44,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ cvs zlib ];
 
-  installPhase = "make install prefix=$out";
+  installFlags = [ "prefix=$(out)" ];
 
   meta = {
     description = ''A tool to generate CVS patch set information'';