diff --git a/nixos/git/home.nix b/nixos/git/home.nix
index 7b7d2eda..199c26ff 100644
--- a/nixos/git/home.nix
+++ b/nixos/git/home.nix
@@ -17,6 +17,7 @@
       diff.algorithm = "histogram";
       diff.renameLimit = 2048;
       diff.renames = "copy";
+      diff.external = "${pkgs.difftastic}/bin/difftastic $LOCAL $REMOTE";
       help.autocorrect = 1;
       merge.renamelimit = 8192;
       mergetool.keepBackup = false;