diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index 86efc882..e3ce6607 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -2008,9 +2008,7 @@ bool Blockchain::have_tx_keyimges_as_spent(const transaction &tx) const
   return false;
 }
 //------------------------------------------------------------------
-// This function validates transaction inputs and their keys.  Previously
-// it also performed double spend checking, but that has been moved to its
-// own function.
+// This function validates transaction inputs and their keys.
 bool Blockchain::check_tx_inputs(const transaction& tx, uint64_t* pmax_used_block_height)
 {
   LOG_PRINT_L3("Blockchain::" << __func__);
@@ -2112,6 +2110,12 @@ bool Blockchain::check_tx_inputs(const transaction& tx, uint64_t* pmax_used_bloc
     // make sure tx output has key offset(s) (is signed to be used)
     CHECK_AND_ASSERT_MES(in_to_key.key_offsets.size(), false, "empty in_to_key.key_offsets in transaction with id " << get_transaction_hash(tx));
 
+    if(have_tx_keyimg_as_spent(in_to_key.k_image))
+    {
+      LOG_PRINT_L1("Key image already spent in blockchain: " << epee::string_tools::pod_to_hex(in_to_key.k_image));
+      return false;
+    }
+
     // basically, make sure number of inputs == number of signatures
     CHECK_AND_ASSERT_MES(sig_index < tx.signatures.size(), false, "wrong transaction: not signature entry for input with index= " << sig_index);