diff --git a/pySim/filesystem.py b/pySim/filesystem.py
index 800f2cc8..d39162c3 100644
--- a/pySim/filesystem.py
+++ b/pySim/filesystem.py
@@ -504,11 +504,12 @@ class CardMF(CardDF):
 class CardADF(CardDF):
     """ADF (Application Dedicated File) in the smart card filesystem"""
 
-    def __init__(self, aid: str, **kwargs):
+    def __init__(self, aid: str, has_fs: bool=False, **kwargs):
         super().__init__(**kwargs)
         # reference to CardApplication may be set from CardApplication constructor
         self.application = None  # type: Optional[CardApplication]
         self.aid = aid           # Application Identifier
+        self.has_fs = has_fs     # Flag to tell whether the ADF supports a filesystem or not
         mf = self.get_mf()
         if mf:
             mf.add_application_df(self)
diff --git a/pySim/ts_31_102.py b/pySim/ts_31_102.py
index 0fcf8836..28781e12 100644
--- a/pySim/ts_31_102.py
+++ b/pySim/ts_31_102.py
@@ -1369,9 +1369,9 @@ class DF_SAIP(CardDF):
 
 
 class ADF_USIM(CardADF):
-    def __init__(self, aid='a0000000871002', name='ADF.USIM', fid=None, sfid=None,
+    def __init__(self, aid='a0000000871002', has_fs=True,  name='ADF.USIM', fid=None, sfid=None,
                  desc='USIM Application'):
-        super().__init__(aid=aid, fid=fid, sfid=sfid, name=name, desc=desc)
+        super().__init__(aid=aid, has_fs=has_fs, fid=fid, sfid=sfid, name=name, desc=desc)
         # add those commands to the general commands of a TransparentEF
         self.shell_commands += [self.AddlShellCommands()]
 
diff --git a/pySim/ts_31_103.py b/pySim/ts_31_103.py
index 4327a1a9..5268c700 100644
--- a/pySim/ts_31_103.py
+++ b/pySim/ts_31_103.py
@@ -258,9 +258,9 @@ class EF_MuDMiDConfigData(BerTlvEF):
 
 
 class ADF_ISIM(CardADF):
-    def __init__(self, aid='a0000000871004', name='ADF.ISIM', fid=None, sfid=None,
+    def __init__(self, aid='a0000000871004', has_fs=True, name='ADF.ISIM', fid=None, sfid=None,
                  desc='ISIM Application'):
-        super().__init__(aid=aid, fid=fid, sfid=sfid, name=name, desc=desc)
+        super().__init__(aid=aid, has_fs=has_fs, fid=fid, sfid=sfid, name=name, desc=desc)
 
         files = [
             EF_IMPI(),
diff --git a/pySim/ts_31_104.py b/pySim/ts_31_104.py
index 0adafba9..239acbf3 100644
--- a/pySim/ts_31_104.py
+++ b/pySim/ts_31_104.py
@@ -30,9 +30,9 @@ from pySim.ts_102_221 import EF_ARR
 
 
 class ADF_HPSIM(CardADF):
-    def __init__(self, aid='a000000087100A', name='ADF.HPSIM', fid=None, sfid=None,
+    def __init__(self, aid='a000000087100A', has_fs=True, name='ADF.HPSIM', fid=None, sfid=None,
                  desc='HPSIM Application'):
-        super().__init__(aid=aid, fid=fid, sfid=sfid, name=name, desc=desc)
+        super().__init__(aid=aid, has_fs=has_fs, fid=fid, sfid=sfid, name=name, desc=desc)
 
         files = [
             EF_ARR(fid='6f06', sfid=0x06),