diff --git a/backend/src/hatchling/builders/constants.py b/backend/src/hatchling/builders/constants.py
index 97ccd6e0b..e18650e1b 100644
--- a/backend/src/hatchling/builders/constants.py
+++ b/backend/src/hatchling/builders/constants.py
@@ -23,6 +23,8 @@
     ".mypy_cache",
     # pixi
     ".pixi",
+    # jujutsu VCS
+    ".jj",
 ))
 EXCLUDED_FILES = frozenset((
     # https://en.wikipedia.org/wiki/.DS_Store