diff --git a/src/flow/binary/balancing.rs b/src/flow/binary/balancing.rs
index ba49efb..559a4f5 100644
--- a/src/flow/binary/balancing.rs
+++ b/src/flow/binary/balancing.rs
@@ -126,3 +126,13 @@ impl<'a, BT: BinaryTreesUnbalanced<'a> + BinaryTreesEmpty<'a>> BinaryTreesEmpty<
         self.0.split_key_empty(tree, key)
     }
 }
+
+impl<'a, BT: BinaryTreesUnbalanced<'a>> BinaryTreesHeight<'a> for BalancedTrees<BT> {
+    fn height(&self, tree: &Self::Tree) -> u64 {
+        self.0.height(tree)
+    }
+
+    fn leaf_height_error<T: 'a>(&self, height: u64) -> BTWrap<'a, Self, T> {
+        self.0.leaf_height_error(height)
+    }
+}