diff --git a/src/bonsai/bonsai/bim/module/style/prop.py b/src/bonsai/bonsai/bim/module/style/prop.py
index b764989b06..2172e42065 100644
--- a/src/bonsai/bonsai/bim/module/style/prop.py
+++ b/src/bonsai/bonsai/bim/module/style/prop.py
@@ -148,8 +148,9 @@ class ColourRgb(PropertyGroup):
     # to fit blender.bim.helper.draw_attribute
     is_uri = False
     is_optional = False
+    special_type = ""
 
-    def get_value_name(self):
+    def get_value_name(self, *args, **kwargs):
         return "color_value"