diff --git a/pkgs/applications/version-management/git-and-tools/default.nix b/pkgs/applications/version-management/git-and-tools/default.nix
index ee24b3295be..0ea406aca81 100644
--- a/pkgs/applications/version-management/git-and-tools/default.nix
+++ b/pkgs/applications/version-management/git-and-tools/default.nix
@@ -194,6 +194,8 @@ let
 
   transcrypt = callPackage ./transcrypt { };
 
+  ydiff = pkgs.python3.pkgs.toPythonApplication pkgs.python3.pkgs.ydiff;
+
 } // lib.optionalAttrs (config.allowAliases or true) (with self; {
   # aliases
   gitAnnex = git-annex;