diff --git a/src/cryptonote_core/cryptonote_format_utils.cpp b/src/cryptonote_core/cryptonote_format_utils.cpp
index 4a1736a..649a387 100644
--- a/src/cryptonote_core/cryptonote_format_utils.cpp
+++ b/src/cryptonote_core/cryptonote_format_utils.cpp
@@ -956,7 +956,7 @@ namespace cryptonote
     {
     case BLOCK_MAJOR_VERSION_1: return check_proof_of_work_v1(bl, current_diffic, proof_of_work);
     case BLOCK_MAJOR_VERSION_2: return check_proof_of_work_v2(bl, current_diffic, proof_of_work);
-    case BLOCK_MAJOR_VERSION_3: return check_proof_of_work_v2(bl, current_diffic, proof_of_work);
+    //case BLOCK_MAJOR_VERSION_3: return check_proof_of_work_v2(bl, current_diffic, proof_of_work);
     }
 
     CHECK_AND_ASSERT_MES(false, false, "unknown block major version: " << bl.major_version << "." << bl.minor_version);