diff --git a/resources/definitions/hms434.def.json b/resources/definitions/hms434.def.json
index ee1869348a..51869b6955 100644
--- a/resources/definitions/hms434.def.json
+++ b/resources/definitions/hms434.def.json
@@ -138,7 +138,7 @@
         "skirt_gap":                 {"value": 1},
         "skirt_brim_minimal_length": {"value": 50},
 
-        "prime_tower_enable":         {"default_value": false },
+        "prime_tower_enable":         {"value": false },
         "prime_tower_wall_thickness": {"resolve": 0.7 },
         "prime_tower_size":           {"value": 20.6 },
         "prime_tower_position_x":     {"value": 125 },