diff --git a/spinetoolbox/spine_db_editor/widgets/tabular_view_mixin.py b/spinetoolbox/spine_db_editor/widgets/tabular_view_mixin.py
index 50dbb3715..b4c7f14ef 100644
--- a/spinetoolbox/spine_db_editor/widgets/tabular_view_mixin.py
+++ b/spinetoolbox/spine_db_editor/widgets/tabular_view_mixin.py
@@ -781,7 +781,6 @@ def _add_values_to_frozen_table(self, frozen_values):
         """
         self.frozen_table_model.add_values(frozen_values)
 
-    @Slot(set)
     def _remove_values_from_frozen_table(self, frozen_values):
         """Removes values from frozen table.