diff --git a/daliuge-translator/dlg-lg.graph.schema b/daliuge-translator/dlg-lg.graph.schema
index 78171856d..10730cca7 100644
--- a/daliuge-translator/dlg-lg.graph.schema
+++ b/daliuge-translator/dlg-lg.graph.schema
@@ -284,7 +284,7 @@
                                     "type": "boolean"
                                 },
                                 "options": {
-                                    "type": "object"
+                                    "type": "array"
                                 },
                                 "positional": {
                                     "type": "boolean",
@@ -329,7 +329,7 @@
                                     "type": "boolean"
                                 },
                                 "options": {
-                                    "type": "object"
+                                    "type": "array"
                                 },
                                 "positional": {
                                     "type": "boolean",