diff --git a/eth2/types/src/attestation_data/mod.rs b/eth2/types/src/attestation_data.rs
similarity index 93%
rename from eth2/types/src/attestation_data/mod.rs
rename to eth2/types/src/attestation_data.rs
index 28504127e..d509f6b3d 100644
--- a/eth2/types/src/attestation_data/mod.rs
+++ b/eth2/types/src/attestation_data.rs
@@ -1,11 +1,8 @@
-use super::Hash256;
+use super::{AttestationDataAndCustodyBit, Hash256};
 use crate::test_utils::TestRandom;
 use rand::RngCore;
 use serde_derive::Serialize;
 use ssz::{hash, Decodable, DecodeError, Encodable, SszStream, TreeHash};
-use std::hash::Hash;
-
-mod signing;
 
 pub const SSZ_ATTESTION_DATA_LENGTH: usize = {
     8 +             // slot
@@ -51,6 +48,14 @@ impl AttestationData {
     pub fn canonical_root(&self) -> Hash256 {
         Hash256::zero()
     }
+
+    pub fn signable_message(&self, custody_bit: bool) -> Vec<u8> {
+        let attestation_data_and_custody_bit = AttestationDataAndCustodyBit {
+            data: self.clone(),
+            custody_bit,
+        };
+        attestation_data_and_custody_bit.hash_tree_root()
+    }
 }
 
 impl Encodable for AttestationData {
diff --git a/eth2/types/src/attestation_data/signing.rs b/eth2/types/src/attestation_data/signing.rs
deleted file mode 100644
index f14cc0ef4..000000000
--- a/eth2/types/src/attestation_data/signing.rs
+++ /dev/null
@@ -1,12 +0,0 @@
-use crate::{AttestationData, AttestationDataAndCustodyBit};
-use ssz::TreeHash;
-
-impl AttestationData {
-    pub fn signable_message(&self, custody_bit: bool) -> Vec<u8> {
-        let attestation_data_and_custody_bit = AttestationDataAndCustodyBit {
-            data: self.clone(),
-            custody_bit,
-        };
-        attestation_data_and_custody_bit.hash_tree_root()
-    }
-}