diff --git a/sh/jshn.sh b/sh/jshn.sh
index b3cd43c..06ba965 100644
--- a/sh/jshn.sh
+++ b/sh/jshn.sh
@@ -103,7 +103,7 @@ json_set_namespace() {
 }
 
 json_cleanup() {
-	local unset
+	local unset tmp
 
 	_json_get_var unset JSON_UNSET
 	for tmp in $unset JSON_VAR; do