diff --git a/src/validation.cpp b/src/validation.cpp
index 947192be0ec65..59c3fb425fe08 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -3122,7 +3122,7 @@ bool CheckBlock(const CBlock& block, CValidationState& state, const Consensus::P
 
     // Check transactions
     for (const auto& tx : block.vtx)
-        if (!CheckTransaction(*tx, state, false))
+        if (!CheckTransaction(*tx, state, true))
             return state.Invalid(false, state.GetRejectCode(), state.GetRejectReason(),
                                  strprintf("Transaction check failed (tx hash %s) %s", tx->GetHash().ToString(), state.GetDebugMessage()));
 
diff --git a/test/functional/p2p_invalid_block.py b/test/functional/p2p_invalid_block.py
index 7be7c9b3ee40f..0678b1a65130d 100755
--- a/test/functional/p2p_invalid_block.py
+++ b/test/functional/p2p_invalid_block.py
@@ -81,6 +81,16 @@ def run_test(self):
 
         node.p2p.send_blocks_and_test([block2], node, success=False, request_block=False, reject_reason='bad-txns-duplicate')
 
+        # Check transactions for duplicate inputs
+        self.log.info("Test duplicate input block.")
+
+        block2_orig.vtx[2].vin.append(block2_orig.vtx[2].vin[0])
+        block2_orig.vtx[2].rehash()
+        block2_orig.hashMerkleRoot = block2_orig.calc_merkle_root()
+        block2_orig.rehash()
+        block2_orig.solve()
+        node.p2p.send_blocks_and_test([block2_orig], node, success=False, request_block=False, reject_reason='bad-txns-inputs-duplicate')
+
         self.log.info("Test very broken block.")
 
         block3 = create_block(tip, create_coinbase(height), block_time)