diff --git a/interfaces/inner_api/syscap_interface.c b/interfaces/inner_api/syscap_interface.c
index 1d5c6189a77ba5744ba73fe2b0420121890cf374..569cab1b14556b29ad798d7594e9eb9aa4e91cae 100644
--- a/interfaces/inner_api/syscap_interface.c
+++ b/interfaces/inner_api/syscap_interface.c
@@ -161,8 +161,8 @@ bool EncodePrivateSyscap(char **output, int *outputLen)
         return false;
     }
 
-    int priLen = bufferLen - PCID_MAIN_BYTES - 1;
-    if (priLen <= 0) {
+    uint32_t priLen = bufferLen - PCID_MAIN_BYTES - 1;
+    if ((int)priLen <= 0) {
         *outputLen = 0;
         return false;
     }
@@ -183,7 +183,7 @@ bool EncodePrivateSyscap(char **output, int *outputLen)
     }
 
     FreeContextBuffer(contextBuffer);
-    *outputLen = strlen(outputStr);
+    *outputLen = (int)strlen(outputStr);
     *output = outputStr;
     return true;
 }