diff --git a/pkgs/applications/search/grepm/default.nix b/pkgs/applications/search/grepm/default.nix
index 1225f036a498..7a3210459d1b 100644
--- a/pkgs/applications/search/grepm/default.nix
+++ b/pkgs/applications/search/grepm/default.nix
@@ -9,7 +9,7 @@ stdenv.mkDerivation {
     sha256 = "0ppprhfw06779hz1b10qvq62gsw73shccsav982dyi6xmqb6jqji";
   };
 
-  phases = [ "installPhase" ];
+  dontUnpack = true;
 
   buildInputs = [ perlPackages.grepmail mutt ];