diff --git a/duplicate/core.py b/duplicate/core.py
index 464bba2..af8689f 100644
--- a/duplicate/core.py
+++ b/duplicate/core.py
@@ -33,7 +33,7 @@
 
 
 def _iterdups(dupinfo):
-    for key, value in dupinfo.dups.items():
+    for key, value in list(dupinfo.dups.items()):
         if isinstance(value, DupInfo):
             for subobj, subkey, subvalue in _iterdups(value):
                 yield subobj, subkey, subvalue
diff --git a/duplicate/structs.py b/duplicate/structs.py
index 1b0077f..79987c8 100644
--- a/duplicate/structs.py
+++ b/duplicate/structs.py
@@ -102,14 +102,14 @@ def __new__(cls, filtertype, dups, errors, parentobj=None, parentkey=None):
         return inst
 
     def __init__(self, *args, **kwargs):
-        super(DupInfo, self).__init__(*args, **kwargs)
+        super(DupInfo, self).__init__()
         self._filter()
 
     def _filter(self, delkey=None):
         dupdict = self.dups
 
         if delkey is None:
-            for key, value in dupdict.items():
+            for key, value in list(dupdict.items()):
                 if len(value) > 1:
                     continue
                 dupdict.pop(key)
diff --git a/duplicate/utils/fs/common.py b/duplicate/utils/fs/common.py
index f06e601..7eed81b 100644
--- a/duplicate/utils/fs/common.py
+++ b/duplicate/utils/fs/common.py
@@ -118,7 +118,7 @@ def _scandir(path, onerror, followlinks):
             if entry.is_file(follow_symlinks=False):
                 files.append(entry)
 
-            elif entry.is_dir(followlinks):
+            elif entry.is_dir():
                 dirs.append(entry)
 
             elif entry.is_file():