diff --git a/util/env-bootstrap.sh b/util/env-bootstrap.sh
index 1e6557df532..b9137f2d08b 100755
--- a/util/env-bootstrap.sh
+++ b/util/env-bootstrap.sh
@@ -106,7 +106,7 @@ __EOT__
     }
 
     nsudo() {
-        [[ ${EUID} -ne 0 ]] && echo "sudo"
+        [[ ${EUID:-} -ne 0 ]] && echo "sudo"
         true
     }