diff --git a/lib/wot/data/mod.rs b/lib/wot/data/mod.rs
index e88b69337c1da0c2a0b9a9fa5d2e8652e74d1c52..d7851b23ca54293c9970c209bc3a0b8d4cce1fc7 100644
--- a/lib/wot/data/mod.rs
+++ b/lib/wot/data/mod.rs
@@ -87,8 +87,6 @@ impl<'de> Deserialize<'de> for NodeId {
 pub enum NewLinkResult {
     /// Certification worked.
     Ok(usize),
-    /// This certification already exist.
-    AlreadyCertified(usize),
     /// All available certifications has been used.
     AllCertificationsUsed(usize),
     /// Unknown source.
diff --git a/lib/wot/data/rusty.rs b/lib/wot/data/rusty.rs
index 22cdd86612fa5e8fd2e51d02f17195572e1844a7..330902254357d389a0aaf07a99824efd85efa03c 100644
--- a/lib/wot/data/rusty.rs
+++ b/lib/wot/data/rusty.rs
@@ -134,8 +134,6 @@ impl WebOfTrust for RustyWebOfTrust {
             NewLinkResult::UnknownTarget()
         } else if self.nodes[source.0].issued_count >= self.max_links {
             NewLinkResult::AllCertificationsUsed(self.nodes[target.0].links_source.len())
-        } else if self.nodes[target.0].links_source.contains(&source) {
-            NewLinkResult::AlreadyCertified(self.nodes[target.0].links_source.len())
         } else {
             self.nodes[source.0].issued_count += 1;
             self.nodes[target.0].links_source.insert(source);
diff --git a/lib/wot/lib.rs b/lib/wot/lib.rs
index de3734d8be3d881faedd273654d1bdca86b52737..669613ce785242857e88441d54459f737e314bff 100644
--- a/lib/wot/lib.rs
+++ b/lib/wot/lib.rs
@@ -196,14 +196,6 @@ mod tests {
         // should be able to add some links, cert count is returned
         assert_eq!(wot.add_link(NodeId(2), NodeId(0)), NewLinkResult::Ok(1));
         assert_eq!(wot.add_link(NodeId(4), NodeId(0)), NewLinkResult::Ok(2));
-        assert_eq!(
-            wot.add_link(NodeId(4), NodeId(0)),
-            NewLinkResult::AlreadyCertified(2)
-        );
-        assert_eq!(
-            wot.add_link(NodeId(4), NodeId(0)),
-            NewLinkResult::AlreadyCertified(2)
-        );
         assert_eq!(wot.add_link(NodeId(5), NodeId(0)), NewLinkResult::Ok(3));
 
         // should exist new links