diff --git a/x/auth/tx/builder.go b/x/auth/tx/builder.go
index 2bee58151cff..ed84b6a23ed1 100644
--- a/x/auth/tx/builder.go
+++ b/x/auth/tx/builder.go
@@ -39,7 +39,6 @@ var (
 	_ tx.TipTx                   = &wrapper{}
 	_ ante.HasExtensionOptionsTx = &wrapper{}
 	_ ExtensionOptionsTxBuilder  = &wrapper{}
-	_ tx.TipTx                   = &wrapper{}
 )
 
 // ExtensionOptionsTxBuilder defines a TxBuilder that can also set extensions.