diff --git a/shared/src/chain_state.rs b/shared/src/chain_state.rs
index 46642e8d32..0f6f8437da 100644
--- a/shared/src/chain_state.rs
+++ b/shared/src/chain_state.rs
@@ -101,9 +101,6 @@ impl<CI: ChainIndex> ChainState<CI> {
 
     pub fn add_tx_to_pool(&self, tx: Transaction, max_cycles: Cycle) -> Result<Cycle, PoolError> {
         let mut tx_pool = self.tx_pool.borrow_mut();
-        if tx_pool.filter.contains(&tx.hash()) {
-            return Err(PoolError::AlreadyInPool);
-        }
         let short_id = tx.proposal_short_id();
         let rtx = self.resolve_tx_from_pool(&tx, &tx_pool);
         let verify_result = self.verify_rtx(&rtx, max_cycles);
diff --git a/shared/src/tx_pool/pool.rs b/shared/src/tx_pool/pool.rs
index 02349e887c..c948b253f0 100644
--- a/shared/src/tx_pool/pool.rs
+++ b/shared/src/tx_pool/pool.rs
@@ -22,10 +22,6 @@ impl TxFilter {
     pub fn insert(&mut self, hash: H256) -> bool {
         self.map.insert(hash, ()).is_none()
     }
-
-    pub fn contains(&self, hash: &H256) -> bool {
-        self.map.contains_key(&hash)
-    }
 }
 
 #[derive(Debug, Clone)]