diff --git a/pkgs/servers/mail/postfix/3.0.nix b/pkgs/servers/mail/postfix/3.0.nix
index 73ab8c8116f3..57c529ac0b65 100644
--- a/pkgs/servers/mail/postfix/3.0.nix
+++ b/pkgs/servers/mail/postfix/3.0.nix
@@ -63,7 +63,7 @@ in stdenv.mkDerivation rec {
   postInstall = ''
     mkdir -p $out
     mv -v installdir/$out/* $out/
-    mv -v installdir/etc $out/etc
+    cp -rv installdir/etc $out
     sed -e '/^PATH=/d' -i $out/libexec/postfix/post-install
     wrapProgram $out/libexec/postfix/post-install \
       --prefix PATH ":" ${coreutils}/bin:${findutils}/bin:${gnugrep}/bin