diff --git a/gossip/src/cluster_info.rs b/gossip/src/cluster_info.rs
index 46b505014bebc3..0f11489333644d 100644
--- a/gossip/src/cluster_info.rs
+++ b/gossip/src/cluster_info.rs
@@ -2475,21 +2475,16 @@ impl ClusterInfo {
 
         // Check if there is a duplicate instance of
         // this node with more recent timestamp.
-        let check_duplicate_instance = {
-            let instance = self.instance.read().unwrap();
-            let my_contact_info = self.my_contact_info();
-            move |values: &[CrdsValue]| {
-                if should_check_duplicate_instance
-                    && values.iter().any(|value| {
-                        instance.check_duplicate(value)
-                            || matches!(&value.data, CrdsData::ContactInfo(other)
-                                if my_contact_info.check_duplicate(other))
-                    })
-                {
-                    return Err(GossipError::DuplicateNodeInstance);
+        let instance = self.instance.read().unwrap();
+        let check_duplicate_instance = |values: &[CrdsValue]| {
+            if should_check_duplicate_instance {
+                for value in values {
+                    if instance.check_duplicate(value) {
+                        return Err(GossipError::DuplicateNodeInstance);
+                    }
                 }
-                Ok(())
             }
+            Ok(())
         };
         let mut pings = Vec::new();
         let mut rng = rand::thread_rng();
diff --git a/gossip/src/contact_info.rs b/gossip/src/contact_info.rs
index 395f485f12516d..9a5c1ce495813b 100644
--- a/gossip/src/contact_info.rs
+++ b/gossip/src/contact_info.rs
@@ -435,14 +435,6 @@ impl ContactInfo {
         node.set_serve_repair_quic((addr, port + 4)).unwrap();
         node
     }
-
-    // Returns true if the other contact-info is a duplicate instance of this
-    // node, with a more recent `outset` timestamp.
-    #[inline]
-    #[must_use]
-    pub(crate) fn check_duplicate(&self, other: &ContactInfo) -> bool {
-        self.pubkey == other.pubkey && self.outset < other.outset
-    }
 }
 
 impl Default for ContactInfo {
@@ -1024,59 +1016,4 @@ mod tests {
             Err(Error::InvalidPort(0))
         );
     }
-
-    #[test]
-    fn test_check_duplicate() {
-        let mut rng = rand::thread_rng();
-        let mut node = ContactInfo::new(
-            Keypair::new().pubkey(),
-            rng.gen(), // wallclock
-            rng.gen(), // shred_version
-        );
-        // Same contact-info is not a duplicate instance.
-        {
-            let other = node.clone();
-            assert!(!node.check_duplicate(&other));
-            assert!(!other.check_duplicate(&node));
-        }
-        // Updated socket address is not a duplicate instance.
-        {
-            let mut other = node.clone();
-            other.set_gossip(new_rand_socket(&mut rng)).unwrap();
-            other.set_serve_repair(new_rand_socket(&mut rng)).unwrap();
-            assert!(!node.check_duplicate(&other));
-            assert!(!other.check_duplicate(&node));
-            other.remove_serve_repair();
-            assert!(!node.check_duplicate(&other));
-            assert!(!other.check_duplicate(&node));
-        }
-        // Updated wallclock is not a duplicate instance.
-        {
-            let other = node.clone();
-            node.set_wallclock(rng.gen());
-            assert!(!node.check_duplicate(&other));
-            assert!(!other.check_duplicate(&node));
-        }
-        // Different pubkey is not a duplicate instance.
-        {
-            let other = ContactInfo::new(
-                Keypair::new().pubkey(),
-                rng.gen(), // wallclock
-                rng.gen(), // shred_version
-            );
-            assert!(!node.check_duplicate(&other));
-            assert!(!other.check_duplicate(&node));
-        }
-        // Same pubkey, more recent outset timestamp is a duplicate instance.
-        {
-            let other = ContactInfo::new(
-                node.pubkey,
-                rng.gen(), // wallclock
-                rng.gen(), // shred_version
-            );
-            assert!(node.outset < other.outset);
-            assert!(node.check_duplicate(&other));
-            assert!(!other.check_duplicate(&node));
-        }
-    }
 }