diff --git a/pkgs/tools/backup/tarsnap/default.nix b/pkgs/tools/backup/tarsnap/default.nix
index 7537451595f..e2857eed7d8 100644
--- a/pkgs/tools/backup/tarsnap/default.nix
+++ b/pkgs/tools/backup/tarsnap/default.nix
@@ -1,6 +1,11 @@
 { stdenv, fetchurl, openssl, zlib, e2fsprogs }:
 
 let
+  bashCompletion = fetchurl {
+    url = "https://gist.githubusercontent.com/thoughtpolice/daa9431044883d3896f6/raw/282360677007db9739e5bf229873d3b231eb303a/tarsnap.bash";
+    sha256 = "1cj7m0n3sw9vlaz2dfvf0bgaxkv1pcc0l31zb4h5rmm8z6d33405";
+  };
+
   zshCompletion = fetchurl {
     url = "https://gist.githubusercontent.com/thoughtpolice/daa9431044883d3896f6/raw/282360677007db9739e5bf229873d3b231eb303a/tarsnap.zsh";
     sha256 = "0pawqwichzpz29rva7mh8lpx4zznnrh2rqyzzj6h7z98l0dxpair";
@@ -8,20 +13,18 @@ let
 in
 stdenv.mkDerivation rec {
   name = "tarsnap-${version}";
-  version = "1.0.36.1";
+  version = "1.0.35";
 
   src = fetchurl {
-    url = "https://www.tarsnap.com/download/tarsnap-autoconf-${version}.tgz";
-    sha256 = "1446l8g39bi5xxk4x1ijc1qjrj824729887gcffig0zrw80rx452";
+    url = "https://www.tarsnap.com/download/tarsnap-autoconf-1.0.35.tgz";
+    sha256 = "16lc14rwrq84fz95j1g10vv0qki0qw73lzighidj5g23pib6g7vc";
   };
 
-  preConfigure = ''
-    configureFlags="--with-bash-completion-dir=$out/etc/bash_completion.d"
-  '';
-
   postInstall = ''
     # Install some handy-dandy shell completions
-    install -m 444 -D ${zshCompletion} $out/share/zsh/site-functions/_tarsnap
+    mkdir -p $out/etc/bash_completion.d $out/share/zsh/site-functions
+    cp ${bashCompletion} $out/etc/bash_completion.d/tarsnap.bash
+    cp ${zshCompletion}  $out/share/zsh/site-functions/_tarsnap
   '';
 
   buildInputs = [ openssl zlib e2fsprogs ];