diff --git a/bitmask_go/launcher_windows.go b/bitmask_go/launcher_windows.go
index d0effa4512ff4fe0d08283a2a3bc654bb541e95b..c8e79b91f400af42d347f5749371ee419961b539 100644
--- a/bitmask_go/launcher_windows.go
+++ b/bitmask_go/launcher_windows.go
@@ -57,7 +57,7 @@ func (l *launcher) firewallStop() error {
 
 func (l *launcher) send(cmd string, args ...string) error {
 	if args == nil {
-		args = "null"
+		args = []string{"null"}
 	}
 	command := struct {
 		Cmd  string `json:"cmd"`