diff --git a/ingester-protocol/src/main/java/io/greptime/models/AuthInfo.java b/ingester-protocol/src/main/java/io/greptime/models/AuthInfo.java
index f8ed5b4..a80c533 100644
--- a/ingester-protocol/src/main/java/io/greptime/models/AuthInfo.java
+++ b/ingester-protocol/src/main/java/io/greptime/models/AuthInfo.java
@@ -55,7 +55,7 @@ public static AuthInfo noAuthorization() {
      * @return the base64 encoded string
      */
     public String toBase64() {
-        String authInfoStr = String.format("%s:%s", this.username, this.password);
+        String authInfoStr = String.format("Basic %s:%s", this.username, this.password);
         return Base64.getEncoder().encodeToString(authInfoStr.getBytes(StandardCharsets.UTF_8));
     }