diff --git a/resources/definitions/ultimaker2.def.json b/resources/definitions/ultimaker2.def.json
index 2f9deb64b1..ca44f154e2 100644
--- a/resources/definitions/ultimaker2.def.json
+++ b/resources/definitions/ultimaker2.def.json
@@ -91,13 +91,13 @@
             "value": false
         },
         "retraction_combing": {
-            "value": "no_outer_surfaces"
+            "value": "'no_outer_surfaces'"
         },
         "skin_monotonic" : {
             "value": true
         },
         "top_bottom_pattern" : {
-            "value":  "zigzag"
+            "value":  "'zigzag'"
         }
     }
 }