diff --git a/cros_workon b/cros_workon
index 682198f290..0b0863ce22 100755
--- a/cros_workon
+++ b/cros_workon
@@ -12,6 +12,8 @@
 
 . /usr/lib/crosutils/common.sh || exit 1
 
+assert_not_root_user
+
 # Script must be run inside the chroot
 get_default_board