diff --git a/interfaces/innerkits/nativetoken/src/nativetoken.c b/interfaces/innerkits/nativetoken/src/nativetoken.c
index d9c08e8dbc80e3eaf371cc46fb00a27f47e72998..fd6e7e3403773b609dfa0859958706ccd4a1084b 100644
--- a/interfaces/innerkits/nativetoken/src/nativetoken.c
+++ b/interfaces/innerkits/nativetoken/src/nativetoken.c
@@ -327,8 +327,8 @@ static int32_t GetAplLevel(const char *aplStr)
 
 static void WriteToFile(const cJSON *root)
 {
-    size_t strLen;
-    size_t writtenLen;
+    ssize_t strLen;
+    ssize_t writtenLen;
 
     char *jsonStr = NULL;
     jsonStr = cJSON_PrintUnformatted(root);