diff --git a/types/types.proto b/types/types.proto
index e330f321d..9e9e4fbba 100644
--- a/types/types.proto
+++ b/types/types.proto
@@ -153,7 +153,7 @@ message ResponseCheckTx {
   int64 gas_wanted  = 5;
   int64 gas_used = 6;
   repeated common.KVPair tags = 7 [(gogoproto.nullable)=false, (gogoproto.jsontag)="tags,omitempty"];
-  common.KI64Pair fee = 8;
+  common.KI64Pair fee = 8 [(gogoproto.nullable)=false, (gogoproto.jsontag)="tags,omitempty"];
 }
 
 message ResponseDeliverTx {
@@ -164,7 +164,7 @@ message ResponseDeliverTx {
   int64 gas_wanted = 5;
   int64 gas_used = 6;
   repeated common.KVPair tags = 7 [(gogoproto.nullable)=false, (gogoproto.jsontag)="tags,omitempty"];
-  common.KI64Pair fee = 8;
+  common.KI64Pair fee = 8 [(gogoproto.nullable)=false, (gogoproto.jsontag)="tags,omitempty"];
 }
 
 message ResponseEndBlock {