diff --git a/libraries/chain/contract_evaluator.cpp b/libraries/chain/contract_evaluator.cpp
index 48f3b684..7559e373 100644
--- a/libraries/chain/contract_evaluator.cpp
+++ b/libraries/chain/contract_evaluator.cpp
@@ -154,6 +154,9 @@ void_result contract_update_evaluator::do_evaluate(const contract_update_operati
 
     const account_object& contract_obj = op.contract(d);
     FC_ASSERT(op.owner == contract_obj.registrar, "only owner can update contract, current owner: ${o}", ("o", contract_obj.registrar));
+    if(d.head_block_time() > HARDFORK_1015_TIME) {
+        FC_ASSERT(contract_obj.code.size() > 0, "can not update a normal account: ${a}", ("a", op.contract));
+    }
 
     code_hash = fc::sha256::hash(op.code);
     FC_ASSERT(code_hash != contract_obj.code_version, "code not updated");
diff --git a/libraries/chain/include/graphene/chain/hardfork.hpp b/libraries/chain/include/graphene/chain/hardfork.hpp
index a586f77b..eba6ba86 100644
--- a/libraries/chain/include/graphene/chain/hardfork.hpp
+++ b/libraries/chain/include/graphene/chain/hardfork.hpp
@@ -85,6 +85,11 @@
 #define HARDFORK_1103_TIME (fc::time_point_sec( 1543507200 ))
 #endif
 
+#ifndef HARDFORK_1015_TIME
+// disable udpate_contract for normal account
+#define HARDFORK_1015_TIME (fc::time_point_sec( 1546084800 )) // for mainnet, 2018-12-29T12:00:00 UTC
+#endif
+
 // #413 Add operation to claim asset fees
 #ifndef HARDFORK_413_TIME
 #define HARDFORK_413_TIME (fc::time_point_sec( 1446652800 ))