diff --git a/eth2/utils/bls/src/public_key.rs b/eth2/utils/bls/src/public_key.rs
index 5a348f530d..5c4c3204c5 100644
--- a/eth2/utils/bls/src/public_key.rs
+++ b/eth2/utils/bls/src/public_key.rs
@@ -7,6 +7,7 @@ use ssz::{
     decode_ssz_list, hash, ssz_encode, Decodable, DecodeError, Encodable, SszStream, TreeHash,
 };
 use std::default;
+use std::fmt;
 use std::hash::{Hash, Hasher};
 
 /// A single BLS signature.
@@ -54,6 +55,12 @@ impl PublicKey {
     }
 }
 
+impl fmt::Display for PublicKey {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.concatenated_hex_id())
+    }
+}
+
 impl default::Default for PublicKey {
     fn default() -> Self {
         let secret_key = SecretKey::random();