diff --git a/resources/definitions/ultimaker.def.json b/resources/definitions/ultimaker.def.json
index a980a1afdf..aec7907dbe 100644
--- a/resources/definitions/ultimaker.def.json
+++ b/resources/definitions/ultimaker.def.json
@@ -7,7 +7,7 @@
         "manufacturer": "Ultimaker B.V.",
         "category": "Ultimaker",
         "visible": false,
-        "exclude_materials": [ "generic_hips", "generic_petg" ]
+        "exclude_materials": [ "generic_hips", "generic_petg", "structur3d_dap100silicone" ]
     },
     "overrides": {
         "machine_max_feedrate_e": {