diff --git a/src/hatch/project/env.py b/src/hatch/project/env.py
index 6bca5d87d..27420cc51 100644
--- a/src/hatch/project/env.py
+++ b/src/hatch/project/env.py
@@ -11,6 +11,7 @@
     from hatch.utils.fs import Path
 
 RESERVED_OPTIONS = {
+    'builder': bool,
     'dependencies': list,
     'extra-dependencies': list,
     'dev-mode': bool,