diff --git a/lib/pages/space_tree/view/custom_expansion.dart b/lib/pages/space_tree/view/custom_expansion.dart
index 515a8448..c06816b4 100644
--- a/lib/pages/space_tree/view/custom_expansion.dart
+++ b/lib/pages/space_tree/view/custom_expansion.dart
@@ -8,8 +8,8 @@ class CustomExpansionTileSpaceTree extends StatelessWidget {
   final bool isSelected;
   final bool isSoldCheck;
   final bool isExpanded;
-  final Function? onExpansionChanged;
-  final Function? onItemSelected;
+  final void Function()? onExpansionChanged;
+  final void Function()? onItemSelected;
 
   const CustomExpansionTileSpaceTree(
       {super.key,