diff --git a/addons/source-python/packages/source-python/commands/filter.py b/addons/source-python/packages/source-python/commands/filter.py
index 2d8f8311a..ece553448 100644
--- a/addons/source-python/packages/source-python/commands/filter.py
+++ b/addons/source-python/packages/source-python/commands/filter.py
@@ -31,9 +31,9 @@ def __init__(self, callback):
         # Register the filter
         self._manager_class.register_filter(self.callback)
 
-    def __call__(self, *args):
+    def __call__(self, *args, **kwargs):
         """Call the callback."""
-        self.callback(*args)
+        return self.callback(*args, **kwargs)
 
     def _unload_instance(self):
         """Unregister the filter."""
diff --git a/addons/source-python/packages/source-python/hooks/base.py b/addons/source-python/packages/source-python/hooks/base.py
index c299a6d92..9a006043b 100644
--- a/addons/source-python/packages/source-python/hooks/base.py
+++ b/addons/source-python/packages/source-python/hooks/base.py
@@ -83,9 +83,9 @@ def __init__(self, callback):
         self.callback = callback
         self._class_instance.append(self.callback)
 
-    def __call__(self, *args):
+    def __call__(self, *args, **kwargs):
         """Call the callback."""
-        self.callback(*args)
+        return self.callback(*args, **kwargs)
 
     def _unload_instance(self):
         """Unregister the hook."""