diff --git a/src/blenderbim/blenderbim/bim/module/model/door.py b/src/blenderbim/blenderbim/bim/module/model/door.py
index 255e578aa9..69b6e28829 100644
--- a/src/blenderbim/blenderbim/bim/module/model/door.py
+++ b/src/blenderbim/blenderbim/bim/module/model/door.py
@@ -439,12 +439,12 @@ def update_door_modifier_bmesh(context):
     obj.data.update()
 
 
-class BIM_OT_add_door(Operator):
+class BIM_OT_add_door(bpy.types.Operator, tool.Ifc.Operator):
     bl_idname = "mesh.add_door"
     bl_label = "Door"
     bl_options = {"REGISTER", "UNDO"}
 
-    def execute(self, context):
+    def _execute(self, context):
         ifc_file = tool.Ifc.get()
         if not ifc_file:
             self.report({"ERROR"}, "You need to start IFC project first to create a door.")
diff --git a/src/blenderbim/blenderbim/bim/module/model/railing.py b/src/blenderbim/blenderbim/bim/module/model/railing.py
index d492704ea8..1e64f5ba5a 100644
--- a/src/blenderbim/blenderbim/bim/module/model/railing.py
+++ b/src/blenderbim/blenderbim/bim/module/model/railing.py
@@ -187,12 +187,12 @@ def get_path_data(obj):
     return path_data
 
 
-class BIM_OT_add_railing(Operator):
+class BIM_OT_add_railing(bpy.types.Operator, tool.Ifc.Operator):
     bl_idname = "mesh.add_railing"
     bl_label = "Railing"
     bl_options = {"REGISTER", "UNDO"}
 
-    def execute(self, context):
+    def _execute(self, context):
         ifc_file = tool.Ifc.get()
         if not ifc_file:
             self.report({"ERROR"}, "You need to start IFC project first to create a railing.")
diff --git a/src/blenderbim/blenderbim/bim/module/model/stair.py b/src/blenderbim/blenderbim/bim/module/model/stair.py
index 035fa5a130..b61980e4e3 100644
--- a/src/blenderbim/blenderbim/bim/module/model/stair.py
+++ b/src/blenderbim/blenderbim/bim/module/model/stair.py
@@ -283,12 +283,12 @@ def update_ifc_stair_props(obj):
     )
 
 
-class BIM_OT_add_clever_stair(Operator):
+class BIM_OT_add_clever_stair(bpy.types.Operator, tool.Ifc.Operator):
     bl_idname = "mesh.add_clever_stair"
     bl_label = "Clever Stair"
     bl_options = {"REGISTER", "UNDO"}
 
-    def execute(self, context):
+    def _execute(self, context):
         ifc_file = tool.Ifc.get()
         if not ifc_file:
             self.report({"ERROR"}, "You need to start IFC project first to create a stair.")
diff --git a/src/blenderbim/blenderbim/bim/module/model/window.py b/src/blenderbim/blenderbim/bim/module/model/window.py
index 8d7b896109..8dee9b3629 100644
--- a/src/blenderbim/blenderbim/bim/module/model/window.py
+++ b/src/blenderbim/blenderbim/bim/module/model/window.py
@@ -406,12 +406,12 @@ def update_window_modifier_bmesh(context):
     obj.data.update()
 
 
-class BIM_OT_add_window(Operator):
+class BIM_OT_add_window(bpy.types.Operator, tool.Ifc.Operator):
     bl_idname = "mesh.add_window"
     bl_label = "Window"
     bl_options = {"REGISTER", "UNDO"}
 
-    def execute(self, context):
+    def _execute(self, context):
         ifc_file = tool.Ifc.get()
         if not ifc_file:
             self.report({"ERROR"}, "You need to start IFC project first to create a window.")