diff --git a/resources/definitions/ultimaker.def.json b/resources/definitions/ultimaker.def.json
index ae2f6c618e..172a7ccfbd 100644
--- a/resources/definitions/ultimaker.def.json
+++ b/resources/definitions/ultimaker.def.json
@@ -221,13 +221,13 @@
             "value": true
         },
         "support_infill_rate": {
-            "value": "=80 if support_enable and support_structure == 'normal' else 0 if support_enable and support_structure == 'tree' else 80"
+            "value": "80 if support_enable and support_structure == 'normal' else 0 if support_enable and support_structure == 'tree' else 80"
         },
         "support_offset": {
-            "value": "=2*line_width"
+            "value": "2*line_width"
         },
         "support_xy_distance": {
-            "value": "=support_offset"
+            "value": "support_offset"
         },
         "support_join_distance": {
             "value": 0
@@ -236,25 +236,25 @@
             "value": 2
         },
         "gradual_support_infill_step_height": {
-            "value": "=4*layer_height"
+            "value": "4*layer_height"
         },
         "minimum_support_area": {
-            "value": "=pow((0.15+support_offset), 2)"
+            "value": "pow((0.15+support_offset), 2)"
         },
         "support_interface_height": {
-            "value": "=2*layer_height"
+            "value": "2*layer_height"
         },
         "support_interface_pattern": {
-            "value": "zigzag"
+            "value": "'zigzag'"
         },
         "support_interface_enable": {
             "value": true
         },
         "minimum_interface_area": {
-            "value": "=minimum_support_area"
+            "value": "minimum_support_area"
         },
         "support_interface_offset": {
-            "value": "=support_offset"
+            "value": "support_offset"
         }
     }
 }