diff --git a/interfaces/inner_api/syscap_interface.c b/interfaces/inner_api/syscap_interface.c
index 6010d1fffde3d1cbfb0794cd2cdeab885bae3261..569cab1b14556b29ad798d7594e9eb9aa4e91cae 100644
--- a/interfaces/inner_api/syscap_interface.c
+++ b/interfaces/inner_api/syscap_interface.c
@@ -162,7 +162,7 @@ bool EncodePrivateSyscap(char **output, int *outputLen)
     }
 
     uint32_t priLen = bufferLen - PCID_MAIN_BYTES - 1;
-    if (priLen <= 0) {
+    if ((int)priLen <= 0) {
         *outputLen = 0;
         return false;
     }