diff --git a/qasync/__init__.py b/qasync/__init__.py
index f68c945..e29c41f 100644
--- a/qasync/__init__.py
+++ b/qasync/__init__.py
@@ -394,13 +394,13 @@ def add_reader(self, fd, callback, *args):
         else:
             # this is necessary to avoid race condition-like issues
             existing.setEnabled(False)
-            existing.activated.disconnect()
+            existing.activated['int'].disconnect()
             # will get overwritten by the assignment below anyways
 
         notifier = QtCore.QSocketNotifier(fd, QtCore.QSocketNotifier.Read)
         notifier.setEnabled(True)
         self._logger.debug('Adding reader callback for file descriptor {}'.format(fd))
-        notifier.activated.connect(
+        notifier.activated['int'].connect(
             lambda: self.__on_notifier_ready(
                 self._read_notifiers, notifier, fd, callback, args)  # noqa: C812
         )
@@ -430,13 +430,13 @@ def add_writer(self, fd, callback, *args):
         else:
             # this is necessary to avoid race condition-like issues
             existing.setEnabled(False)
-            existing.activated.disconnect()
+            existing.activated['int'].disconnect()
             # will get overwritten by the assignment below anyways
 
         notifier = QtCore.QSocketNotifier(fd, QtCore.QSocketNotifier.Write)
         notifier.setEnabled(True)
         self._logger.debug('Adding writer callback for file descriptor {}'.format(fd))
-        notifier.activated.connect(
+        notifier.activated['int'].connect(
             lambda: self.__on_notifier_ready(
                 self._write_notifiers, notifier, fd, callback, args)  # noqa: C812
         )
@@ -470,7 +470,7 @@ def __notifier_cb_wrapper(self, notifiers, notifier, fd, callback, args):
             if notifiers.get(fd, None) is notifier:
                 notifier.setEnabled(True)
             else:
-                notifier.activated.disconnect()
+                notifier.activated['int'].disconnect()
 
     def __on_notifier_ready(self, notifiers, notifier, fd, callback, args):
         if fd not in notifiers:
diff --git a/qasync/_unix.py b/qasync/_unix.py
index debe703..d924290 100644
--- a/qasync/_unix.py
+++ b/qasync/_unix.py
@@ -110,11 +110,11 @@ def register(self, fileobj, events, data=None):
 
         if events & EVENT_READ:
             notifier = QtCore.QSocketNotifier(key.fd, QtCore.QSocketNotifier.Read)
-            notifier.activated.connect(self.__on_read_activated)
+            notifier.activated['int'].connect(self.__on_read_activated)
             self.__read_notifiers[key.fd] = notifier
         if events & EVENT_WRITE:
             notifier = QtCore.QSocketNotifier(key.fd, QtCore.QSocketNotifier.Write)
-            notifier.activated.connect(self.__on_write_activated)
+            notifier.activated['int'].connect(self.__on_write_activated)
             self.__write_notifiers[key.fd] = notifier
 
         return key
@@ -138,7 +138,7 @@ def drop_notifier(notifiers):
             except KeyError:
                 pass
             else:
-                notifier.activated.disconnect()
+                notifier.activated['int'].disconnect()
 
         try:
             key = self._fd_to_key.pop(self._fileobj_lookup(fileobj))