diff --git a/tomb b/tomb
index c299d142..04f36224 100755
--- a/tomb
+++ b/tomb
@@ -131,7 +131,7 @@ _sudo() {
 		esac
 
 	else
-    if "`id -u`" = "0"; then
+    if [[ "`id -u`" = "0" ]]; then
 			_verbose "Super user execution skipped (SUID caller)"
 			${@}
 			return $?