diff --git a/beacon_chain/utils/bls/src/aggregate_signature.rs b/beacon_chain/utils/bls/src/aggregate_signature.rs
index 5cc9c3c21..656b7e4ad 100644
--- a/beacon_chain/utils/bls/src/aggregate_signature.rs
+++ b/beacon_chain/utils/bls/src/aggregate_signature.rs
@@ -29,13 +29,6 @@ impl AggregateSignature {
     }
 }
 
-impl Default for AggregateSignature {
-    /// A "default" signature is a signature across an empty message by a secret key of 48 zeros.
-    fn default() -> Self {
-        AggregateSignature::new()
-    }
-}
-
 impl Encodable for AggregateSignature {
     fn ssz_append(&self, s: &mut SszStream) {
         s.append_vec(&self.0.as_bytes());
diff --git a/beacon_chain/utils/bls/src/signature.rs b/beacon_chain/utils/bls/src/signature.rs
index bfeaca45e..ebdb5b817 100644
--- a/beacon_chain/utils/bls/src/signature.rs
+++ b/beacon_chain/utils/bls/src/signature.rs
@@ -36,17 +36,6 @@ impl Signature {
     }
 }
 
-impl Default for Signature {
-    /// A "default" signature is a signature across an empty message by a secret key of 48 zeros.
-    fn default() -> Self {
-        let sk = match SecretKey::from_bytes(&[0; 48]) {
-            Ok(key) => key,
-            _ => unreachable!(), // Key is static, should not fail.
-        };
-        Signature(RawSignature::new(&[], &sk))
-    }
-}
-
 impl Encodable for Signature {
     fn ssz_append(&self, s: &mut SszStream) {
         s.append_vec(&self.0.as_bytes());