diff --git a/nix/lean-dev.in b/nix/lean-dev.in
index 9bee622ee6..02849ad55f 100644
--- a/nix/lean-dev.in
+++ b/nix/lean-dev.in
@@ -1,6 +1,6 @@
 #!@bash@/bin/bash
 
-set -euxo pipefail
+set -euo pipefail
 
 root="."
 # find package root