diff --git a/.envrc b/.envrc
index 9d7a14f23e9..6b42fd7a3a0 100644
--- a/.envrc
+++ b/.envrc
@@ -1,3 +1,7 @@
+# Inherit from a parent .envrc when this repo is checked out as a worktree
+# group (see https://github.com/nvie/worktrees). No-op in a normal checkout.
+source_up_if_exists
+
 layout node
 
 # Automatically put scripts/ in your $PATH, as long as you