diff --git a/jsonrpc.go b/jsonrpc.go
index 3c805e4..9534af1 100644
--- a/jsonrpc.go
+++ b/jsonrpc.go
@@ -994,7 +994,7 @@ var rpcHandlers = map[string]RPCHandler{
 	"keyboardReport":         {Func: rpcKeyboardReport, Params: []string{"modifier", "keys"}},
 	"absMouseReport":         {Func: rpcAbsMouseReport, Params: []string{"x", "y", "buttons"}},
 	"relMouseReport":         {Func: rpcRelMouseReport, Params: []string{"dx", "dy", "buttons"}},
-	"wheelReport":            {Func: rpcWheelReport, Params: []string{"wheelY"}},
+	"wheelReport":            {Func: rpcWheelReport, Params: []string{"wheelY", "wheelX"}},
 	"getVideoState":          {Func: rpcGetVideoState},
 	"getUSBState":            {Func: rpcGetUSBState},
 	"unmountImage":           {Func: rpcUnmountImage},