diff --git a/lib/_included_packages/plexnet/signalslot/signal.py b/lib/_included_packages/plexnet/signalslot/signal.py
index 3d29d7bd8..9cd2f9a94 100644
--- a/lib/_included_packages/plexnet/signalslot/signal.py
+++ b/lib/_included_packages/plexnet/signalslot/signal.py
@@ -93,10 +93,10 @@ def connect(self, slot):
         """
         if not isinstance(slot, BaseSlot):
             try:
-                if inspect.getargspec(slot).keywords is None:
+                if inspect.getfullargspec(slot).kwonlyargs is None:
                     raise exceptions.SlotMustAcceptKeywords(self, slot)
             except TypeError:
-                if inspect.getargspec(slot.__call__).keywords is None:
+                if inspect.getfullargspec(slot.__call__).kwonlyargs is None:
                     raise exceptions.SlotMustAcceptKeywords(self, slot)
 
         with self._slots_lk: