diff --git a/frappy/modulebase.py b/frappy/modulebase.py
index b9487df5..b1bd473c 100644
--- a/frappy/modulebase.py
+++ b/frappy/modulebase.py
@@ -37,10 +37,6 @@ from frappy.params import Accessible, Command, Parameter, Limit, PREDEFINED_ACCE
 from frappy.properties import HasProperties, Property
 from frappy.logging import RemoteLogHandler
 
-# TODO: resolve cirular import
-# from .interfaces import SECoP_BASE_CLASSES
-# WORKAROUND:
-SECoP_BASE_CLASSES = ['Readable', 'Writable', 'Drivable', 'Communicator']
 PREDEF_ORDER = list(PREDEFINED_ACCESSIBLES)
 
 Done = UniqueObject('Done')
@@ -310,8 +306,8 @@ class Module(HasAccessibles):
                           default='user', extname='visibility')
     implementation = Property('internal name of the implementation class of the module', StringType(),
                               extname='implementation')
-    interface_classes = Property('offical highest interface-class of the module', ArrayOf(StringType()),
-                                 extname='interface_classes')
+    interface_classes = Property('offical interface-classes of the module', ArrayOf(StringType()),
+                                 extname='interface_classes', default=[])
     features = Property('list of features', ArrayOf(StringType()), extname='features')
     pollinterval = Property('poll interval for parameters handled by doPoll', FloatRange(0.1, 120), default=5)
     slowinterval = Property('poll interval for other parameters', FloatRange(0.1, 120), default=15)
@@ -375,10 +371,6 @@ class Module(HasAccessibles):
         myclassname = f'{mycls.__module__}.{mycls.__name__}'
         self.implementation = myclassname
 
-        # list of only the 'highest' secop module class
-        self.interface_classes = [
-            b.__name__ for b in mycls.__mro__ if b.__name__ in SECoP_BASE_CLASSES][:1]
-
         # handle Features
         self.features = [b.__name__ for b in mycls.__mro__ if Feature in b.__bases__]
 
diff --git a/frappy/modules.py b/frappy/modules.py
index 241a9bc2..425e63d8 100644
--- a/frappy/modules.py
+++ b/frappy/modules.py
@@ -36,6 +36,7 @@ from .modulebase import Module
 
 class Readable(Module):
     """basic readable module"""
+    interface_classes = ['Readable']
     # pylint: disable=invalid-name
     Status = Enum('Status',
                   IDLE=StatusType.IDLE,
@@ -55,6 +56,7 @@ class Readable(Module):
 
 class Writable(Readable):
     """basic writable module"""
+    interface_classes = ['Writable']
     target = Parameter('target value of the module',
                        default=0, readonly=False, datatype=FloatRange(unit='$'))
 
@@ -74,7 +76,7 @@ class Writable(Readable):
 
 class Drivable(Writable):
     """basic drivable module"""
-
+    interface_classes = ['Drivable']
     status = Parameter(datatype=StatusType(Readable, 'BUSY'))  # extend Readable.status
 
     def isBusy(self, status=None):
@@ -98,6 +100,7 @@ class Drivable(Writable):
 
 class Communicator(HasComlog, Module):
     """basic abstract communication module"""
+    interface_classes = ['Communicator']
 
     @Command(StringType(), result=StringType())
     def communicate(self, command):
@@ -109,9 +112,6 @@ class Communicator(HasComlog, Module):
         raise NotImplementedError()
 
 
-SECoP_BASE_CLASSES = {Readable, Writable, Drivable, Communicator}
-
-
 class Attached(Property):
     """a special property, defining an attached module