diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index 3a4b7f514..aaefe6a98 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -2553,7 +2553,7 @@ bool Blockchain::check_tx_inputs(transaction& tx, tx_verification_context &tvc,
       }
     }
 
-    if (hf_version >= HF_VERSION_MIN_MIXIN_10 && mixin != 10)
+    if (((hf_version == HF_VERSION_MIN_MIXIN_10 || hf_version == HF_VERSION_MIN_MIXIN_10+1) && mixin != 10) || (hf_version >= HF_VERSION_MIN_MIXIN_10+2 && mixin > 10))
     {
       MERROR_VER("Tx " << get_transaction_hash(tx) << " has invalid ring size (" << (mixin + 1) << "), it should be 11");
       tvc.m_low_mixin = true;