diff --git a/rtree/index.py b/rtree/index.py
index 169a1e96..b6a510f9 100644
--- a/rtree/index.py
+++ b/rtree/index.py
@@ -297,7 +297,7 @@ def __len__(self) -> int:
             return 0
 
     def __repr__(self) -> str:
-        return f"rtree.index.Index(bounds={self.bounds}, size={self.get_size()})"
+        return f"rtree.index.Index(bounds={self.bounds}, size={len(self)})"
 
     def __getstate__(self) -> dict[str, Any]:
         state = self.__dict__.copy()