diff --git a/beacon_chain/types/src/common/maps.rs b/beacon_chain/types/src/common/maps.rs
deleted file mode 100644
index 6b7c5da19..000000000
--- a/beacon_chain/types/src/common/maps.rs
+++ /dev/null
@@ -1,7 +0,0 @@
-use std::collections::HashMap;
-
-/// Maps a (slot, shard_id) to attestation_indices.
-pub type AttesterMap = HashMap<(u64, u16), Vec<usize>>;
-
-/// Maps a slot to a block proposer.
-pub type ProposerMap = HashMap<u64, usize>;
diff --git a/beacon_chain/types/src/common/mod.rs b/beacon_chain/types/src/common/mod.rs
deleted file mode 100644
index 76d294b23..000000000
--- a/beacon_chain/types/src/common/mod.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-mod delegation;
-mod shuffling;
-
-pub mod maps;
-pub mod attestation_parent_hashes;
-
-use super::utils;
-use super::utils::types::Hash256;
-pub use self::shuffling::shuffle;