diff --git a/internal/logic/common/getStatLogic.go b/internal/logic/common/getStatLogic.go
index 4991d86..a40bde2 100644
--- a/internal/logic/common/getStatLogic.go
+++ b/internal/logic/common/getStatLogic.go
@@ -66,11 +66,11 @@ func (l *GetStatLogic) GetStat() (resp *types.GetStatResponse, err error) {
 
 	country := 0
 
-	protocolDict := make(map[string]void)
+	protocolDict := make(map[string]struct{})
 	var protocol []string
 	l.svcCtx.DB.Model(&server.Server{}).Where("enable = true").Pluck("protocol", &protocol)
 	for _, p := range protocol {
-		protocolDict[p] = v
+		protocolDict[p] = struct{}{}
 	}
 	protocol = nil
 	for p := range protocolDict {