diff --git a/src/mrds/trees/heighted.rs b/src/mrds/trees/heighted.rs
index f836c93..2fa4d4b 100644
--- a/src/mrds/trees/heighted.rs
+++ b/src/mrds/trees/heighted.rs
@@ -70,6 +70,12 @@ impl<A> Trees<A> {
     }
 }
 
+impl<A> Default for Trees<A> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl<A> Clone for Trees<A> {
     fn clone(&self) -> Self {
         Self::new()