diff --git a/cmd/geth/retesteth.go b/cmd/geth/retesteth.go
index 4663c04c52..eb6aaf272c 100644
--- a/cmd/geth/retesteth.go
+++ b/cmd/geth/retesteth.go
@@ -68,7 +68,6 @@ var (
 )
 
 type RetestethTestAPI interface {
-	SetRPCPayloadSize(ctx context.Context, size int) (int, error)
 	SetChainParams(ctx context.Context, chainParams ChainParams) (bool, error)
 	MineBlocks(ctx context.Context, number uint64) (bool, error)
 	ModifyTimestamp(ctx context.Context, interval uint64) (bool, error)
@@ -272,10 +271,6 @@ func (e *NoRewardEngine) Close() error {
 	return e.inner.Close()
 }
 
-func (api *RetestethAPI) SetRPCPayloadSize(ctx context.Context, size int) (int, error) {
-	return rpc.SetMaxRequestContentLength(size)
-}
-
 func (api *RetestethAPI) SetChainParams(ctx context.Context, chainParams ChainParams) (bool, error) {
 	// Clean up
 	if api.blockchain != nil {
@@ -870,6 +865,9 @@ func retesteth(ctx *cli.Context) error {
 	vhosts := splitAndTrim(ctx.GlobalString(utils.RPCVirtualHostsFlag.Name))
 	cors := splitAndTrim(ctx.GlobalString(utils.RPCCORSDomainFlag.Name))
 
+	// Increase the RPC request size
+	rpc.SetMaxRequestContentLength(10 * 1024 * 1024)
+
 	// start http server
 	httpEndpoint := fmt.Sprintf("%s:%d", ctx.GlobalString(utils.RPCListenAddrFlag.Name), ctx.Int(rpcPortFlag.Name))
 	listener, _, err := rpc.StartHTTPEndpoint(httpEndpoint, rpcAPI, []string{"test", "eth", "debug", "web3"}, cors, vhosts, rpc.DefaultHTTPTimeouts)