diff --git a/rpcserver.go b/rpcserver.go
index 61cdc5624..e7887e86b 100644
--- a/rpcserver.go
+++ b/rpcserver.go
@@ -6,7 +6,6 @@ import (
 	"github.com/btcsuite/btcutil"
 	"github.com/btcsuite/btcwallet/waddrmgr"
 	"golang.org/x/net/context"
-	"google.golang.org/grpc"
 	"li.lan/labs/plasma/lnwallet"
 	"li.lan/labs/plasma/rpcprotos"
 )
@@ -20,14 +19,15 @@ type rpcServer struct {
 	lnwallet *lnwallet.LightningWallet
 }
 
+var _ lnrpc.LightningServer = (*rpcServer)(nil)
+
 // newRpcServer...
 func newRpcServer(wallet *lnwallet.LightningWallet) *rpcServer {
 	return &rpcServer{wallet}
 }
 
 // SendMany...
-func (r *rpcServer) SendMany(ctx context.Context, in *lnrpc.SendManyRequest,
-	opts ...grpc.CallOption) (*lnrpc.SendManyResponse, error) {
+func (r *rpcServer) SendMany(ctx context.Context, in *lnrpc.SendManyRequest) (*lnrpc.SendManyResponse, error) {
 
 	sendMap := make(map[string]btcutil.Amount)
 	for addr, amt := range in.AddrToAmount {
@@ -43,8 +43,7 @@ func (r *rpcServer) SendMany(ctx context.Context, in *lnrpc.SendManyRequest,
 }
 
 // NewAddress...
-func (r *rpcServer) NewAddress(ctx context.Context, in *lnrpc.NewAddressRequest,
-	opts ...grpc.CallOption) (*lnrpc.NewAddressResponse, error) {
+func (r *rpcServer) NewAddress(ctx context.Context, in *lnrpc.NewAddressRequest) (*lnrpc.NewAddressResponse, error) {
 
 	r.lnwallet.KeyGenMtx.Lock()
 	defer r.lnwallet.KeyGenMtx.Unlock()