diff --git a/jj/config.toml b/jj/config.toml
index 02ca32b..e1d3eb6 100644
--- a/jj/config.toml
+++ b/jj/config.toml
@@ -7,6 +7,7 @@ tug = ["bookmark", "move", "--from", "heads(::@- & bookmarks())", "--to", "@-"]
 [ui]
 default-command = ["log", "--no-pager"]
 should-sign-off = true
+diff-formatter = ["difft", "--color=always", "--syntax-highlight=off", "$left", "$right"]
 # diff-editor = ["nvim", "-c", "DiffEditor $left $right $output"]
 # merge-editor = "vimdiff"
 # conflict-marker-style = "git"
diff --git a/nix/flake.nix b/nix/flake.nix
index 97d6c6b..8174ec2 100644
--- a/nix/flake.nix
+++ b/nix/flake.nix
@@ -55,6 +55,7 @@
         pkgs.bacon
         pkgs.bleve-cli
         pkgs.btop
+        pkgs.difftastic
         pkgs.direnv
         pkgs.dust
         pkgs.eza