diff --git a/templates/LotteryGameContract/src/Protobuf/reference/acs12.proto b/templates/LotteryGameContract/src/Protobuf/reference/acs12.proto
index e6ead4b..7edce8a 100644
--- a/templates/LotteryGameContract/src/Protobuf/reference/acs12.proto
+++ b/templates/LotteryGameContract/src/Protobuf/reference/acs12.proto
@@ -10,7 +10,6 @@ package acs12;
 import public "aelf/options.proto";
 import public "google/protobuf/empty.proto";
 import public "google/protobuf/wrappers.proto";
-import "aelf/core.proto";
 
 option (aelf.identity) = "acs12";
 option csharp_namespace = "AElf.Standards.ACS12";
diff --git a/templates/LotteryGameContract/test/Protobuf/reference/acs12.proto b/templates/LotteryGameContract/test/Protobuf/reference/acs12.proto
index e6ead4b..7edce8a 100644
--- a/templates/LotteryGameContract/test/Protobuf/reference/acs12.proto
+++ b/templates/LotteryGameContract/test/Protobuf/reference/acs12.proto
@@ -10,7 +10,6 @@ package acs12;
 import public "aelf/options.proto";
 import public "google/protobuf/empty.proto";
 import public "google/protobuf/wrappers.proto";
-import "aelf/core.proto";
 
 option (aelf.identity) = "acs12";
 option csharp_namespace = "AElf.Standards.ACS12";