diff --git a/framework/src/binding/store/mod.rs b/framework/src/binding/store/mod.rs
index d669c2ed6..51974e0e3 100644
--- a/framework/src/binding/store/mod.rs
+++ b/framework/src/binding/store/mod.rs
@@ -12,47 +12,6 @@ pub use array::DefaultStoreArray;
 pub use map::DefaultStoreMap;
 pub use primitive::{DefaultStoreBool, DefaultStoreString, DefaultStoreUint64};
 
-pub struct FixedKeys<K: FixedCodec> {
-    pub inner: Vec<K>,
-}
-
-impl<K: FixedCodec> rlp::Encodable for FixedKeys<K> {
-    fn rlp_append(&self, s: &mut rlp::RlpStream) {
-        let inner: Vec<Vec<u8>> = self
-            .inner
-            .iter()
-            .map(|k| k.encode_fixed().expect("encode should not fail").to_vec())
-            .collect();
-
-        s.begin_list(1).append_list::<Vec<u8>, _>(&inner);
-    }
-}
-
-impl<K: FixedCodec> rlp::Decodable for FixedKeys<K> {
-    fn decode(r: &rlp::Rlp) -> Result<Self, rlp::DecoderError> {
-        let inner_u8: Vec<Vec<u8>> = rlp::decode_list(r.at(0)?.as_raw());
-
-        let inner_k: Result<Vec<K>, _> = inner_u8
-            .into_iter()
-            .map(|v| <_>::decode_fixed(Bytes::from(v)))
-            .collect();
-
-        let inner = inner_k.map_err(|_| rlp::DecoderError::Custom("decode K from bytes fail"))?;
-
-        Ok(FixedKeys { inner })
-    }
-}
-
-impl<K: FixedCodec> FixedCodec for FixedKeys<K> {
-    fn encode_fixed(&self) -> ProtocolResult<Bytes> {
-        Ok(Bytes::from(rlp::encode(self)))
-    }
-
-    fn decode_fixed(bytes: Bytes) -> ProtocolResult<Self> {
-        Ok(rlp::decode(bytes.as_ref()).map_err(FixedCodecError::from)?)
-    }
-}
-
 pub struct FixedBuckets<K: FixedCodec + PartialEq> {
     pub keys_bucket:  Vec<Bucket<K>>,
     pub bucket_lens:  Vec<u32>,