diff --git a/wotb/lib.rs b/wotb/lib.rs
index 5a388cf262f94e78228840c26fe360ba17753d9c..8d760fb166a131334acc3fe9163b3b25e068ebc4 100644
--- a/wotb/lib.rs
+++ b/wotb/lib.rs
@@ -166,7 +166,7 @@ pub struct WotDistance {
 /// Trait for a Web Of Trust.
 /// Allow to provide other implementations of the `WoT` logic instead of the legacy C++
 /// translated one.
-pub trait WebOfTrust {
+pub trait WebOfTrust: Clone {
     /// Get the maximum number of links per user.
     fn get_max_link(&self) -> usize;