diff --git a/modules/aum/backend.py b/modules/aum/backend.py
index e27d3e71..a833d027 100644
--- a/modules/aum/backend.py
+++ b/modules/aum/backend.py
@@ -240,7 +240,7 @@ class AuMBackend(BaseBackend, ICapMessages, ICapMessagesPost, ICapDating, ICapCh
 
         return thread
 
-    def iter_unread_messages(self, thread=None):
+    def iter_unread_messages(self):
         try:
             contacts = {}
             with self.browser:
diff --git a/modules/bnporc/backend.py b/modules/bnporc/backend.py
index f771b804..c835b47e 100644
--- a/modules/bnporc/backend.py
+++ b/modules/bnporc/backend.py
@@ -149,7 +149,7 @@ class BNPorcBackend(BaseBackend, ICapBank, ICapMessages):
             thread = self.browser.get_thread(thread)
         return thread
 
-    def iter_unread_messages(self, thread=None):
+    def iter_unread_messages(self):
         threads = list(self.iter_threads(cache=True))
         for thread in threads:
             if thread.root.flags & thread.root.IS_UNREAD:
diff --git a/modules/dlfp/backend.py b/modules/dlfp/backend.py
index 16860a6d..0c57014e 100644
--- a/modules/dlfp/backend.py
+++ b/modules/dlfp/backend.py
@@ -172,7 +172,7 @@ class DLFPBackend(BaseBackend, ICapMessages, ICapMessagesPost, ICapContent):
         for sub in com.comments:
             self._insert_comment(sub, message, getseen)
 
-    def iter_unread_messages(self, thread=None):
+    def iter_unread_messages(self):
         for thread in self.iter_threads():
             self.fill_thread(thread, 'root', False)
             for m in thread.iter_all_messages():
diff --git a/modules/hds/backend.py b/modules/hds/backend.py
index b59800e5..e0d0d196 100644
--- a/modules/hds/backend.py
+++ b/modules/hds/backend.py
@@ -88,7 +88,7 @@ class HDSBackend(BaseBackend, ICapMessages):
 
         return thread
 
-    def iter_unread_messages(self, thread=None):
+    def iter_unread_messages(self):
         for thread in self.iter_threads():
             if thread.id in self.storage.get('seen', default=[]):
                 continue
diff --git a/modules/newsfeed/backend.py b/modules/newsfeed/backend.py
index 472b58e8..f6b0350b 100644
--- a/modules/newsfeed/backend.py
+++ b/modules/newsfeed/backend.py
@@ -76,7 +76,7 @@ class NewsfeedBackend(BaseBackend, ICapMessages):
 
 
 
-    def iter_unread_messages(self, thread=None):
+    def iter_unread_messages(self):
         for thread in self.iter_threads():
             for m in thread.iter_all_messages():
                 if m.flags & m.IS_UNREAD:
diff --git a/modules/phpbb/backend.py b/modules/phpbb/backend.py
index 7ee40aea..c55c2eb5 100644
--- a/modules/phpbb/backend.py
+++ b/modules/phpbb/backend.py
@@ -130,7 +130,7 @@ class PhpBBBackend(BaseBackend, ICapMessages, ICapMessagesPost):
                        children=[],
                        flags=Message.IS_HTML)
 
-    def iter_unread_messages(self, thread=None):
+    def iter_unread_messages(self):
         with self.browser:
             url = self.browser.get_root_feed_url()
             for article in Newsfeed(url, rssid).iter_entries():
diff --git a/weboob/capabilities/messages.py b/weboob/capabilities/messages.py
index 624d663c..db1e2b7d 100644
--- a/weboob/capabilities/messages.py
+++ b/weboob/capabilities/messages.py
@@ -140,11 +140,10 @@ class ICapMessages(IBaseCap):
         """
         raise NotImplementedError()
 
-    def iter_unread_messages(self, thread=None):
+    def iter_unread_messages(self):
         """
         Iterates on messages which hasn't been marked as read.
 
-        @param thread  thread name (optional)
         @return [iter]  Message objects
         """
         raise NotImplementedError()
diff --git a/weboob/tools/capabilities/messages/GenericBackend.py b/weboob/tools/capabilities/messages/GenericBackend.py
index 5760e1e8..3e8c92d8 100644
--- a/weboob/tools/capabilities/messages/GenericBackend.py
+++ b/weboob/tools/capabilities/messages/GenericBackend.py
@@ -87,7 +87,7 @@ class GenericNewspaperBackend(BaseBackend, ICapMessages):
         t = self.get_thread(thread)
         return t or thread
 
-    def iter_unread_messages(self, thread=None):
+    def iter_unread_messages(self):
         for thread in self.iter_threads():
             if thread.id in self.storage.get('seen', default={}):
                 continue