diff --git a/BaseClasses.py b/BaseClasses.py
index 710a267e52bf..e2e9d7dcb517 100644
--- a/BaseClasses.py
+++ b/BaseClasses.py
@@ -114,9 +114,9 @@ def extend(self, regions: Iterable[Region]):
                 self.region_cache[region.player][region.name] = region
 
         def add_group(self, new_id: int):
-            self.region_cache.update({new_id: {}})
-            self.entrance_cache.update({new_id: {}})
-            self.location_cache.update({new_id: {}})
+            self.region_cache[new_id] = {}
+            self.entrance_cache[new_id] = {}
+            self.location_cache[new_id] = {}
 
         def __iter__(self) -> Iterator[Region]:
             for regions in self.region_cache.values():