diff --git a/pkgs/applications/version-management/git-up/default.nix b/pkgs/applications/version-management/git-up/default.nix
index 4b6ba9398b48..45c97868c4bf 100644
--- a/pkgs/applications/version-management/git-up/default.nix
+++ b/pkgs/applications/version-management/git-up/default.nix
@@ -31,5 +31,6 @@ python2Packages.buildPythonApplication rec {
     license = licenses.mit;
     maintainers = with maintainers; [ peterhoeg ];
     platforms = platforms.all;
+    broken = true; # Incompatible with Git 2.15 object store.
   };
 }