diff --git a/bin/dkpurge b/bin/dkpurge
index 5fc1314..54068eb 100755
--- a/bin/dkpurge
+++ b/bin/dkpurge
@@ -2,7 +2,7 @@
 
 PS="$(docker ps -aq 2> /dev/null)"
 
-if [ "$?" ] && [ "$EUID" != 0 ]; then
+if [ "$?" != 0 ] && [ "$EUID" != 0 ]; then
     sudo -- "$0" "$@"
     exit
 fi