diff --git a/playbook/execute.sh b/playbook/execute.sh
index 35a60f9..0ae424d 100644
--- a/playbook/execute.sh
+++ b/playbook/execute.sh
@@ -4,7 +4,8 @@ DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )";
 source "$DIR/_common.sh";
 
 function is_update() {
-    return [ -d /playbook.old ];
+    [ -d /playbook.old ];
+    return $?;
 }
 
 cd "$DIR";