diff --git a/rpc/websockets.go b/rpc/websockets.go
index 81b4948009..a52c609223 100644
--- a/rpc/websockets.go
+++ b/rpc/websockets.go
@@ -55,7 +55,7 @@ type WebsocketsServer interface {
 type SubscriptionResponseJSON struct {
 	Jsonrpc string      `json:"jsonrpc"`
 	Result  interface{} `json:"result"`
-	ID      float64     `json:"id"`
+	ID      interface{} `json:"id,omitempty"`
 }
 
 type SubscriptionNotification struct {
@@ -225,11 +225,11 @@ func (s *websocketsServer) readLoop(wsConn *wsConn) {
 			continue
 		}
 
-		connID, ok := msg["id"].(float64)
+		connID, ok := msg["id"]
 		if !ok {
 			s.sendErrResponse(
 				wsConn,
-				fmt.Errorf("invalid type for connection ID: %T", msg["id"]).Error(),
+				"missing required connection ID",
 			)
 			continue
 		}