diff --git a/src/create_pcid.c b/src/create_pcid.c
index 0549f05..c346a43 100644
--- a/src/create_pcid.c
+++ b/src/create_pcid.c
@@ -358,7 +358,7 @@ static int32_t GetPriSyscapResult(cJSON *capVectorPtr, int32_t ret)
     return ret;
 }
 
-int32_t GetPriSyscap(PCIDMain *pcidMain, cJSON *sysCapObject, uint32_t contextBufLen)
+int32_t GetPriSyscap(PCIDMain *pcidMain, cJSON *sysCapObject, int32_t contextBufLen)
 {
     cJSON *capVectorPtr = cJSON_CreateArray();
     if (capVectorPtr == NULL) {
@@ -366,7 +366,7 @@ int32_t GetPriSyscap(PCIDMain *pcidMain, cJSON *sysCapObject, uint32_t contextBu
         return -1;
     }
 
-    int32_t privateSyscapLen = (int32_t)(contextBufLen - sizeof(PCIDMain) - 1);
+    int32_t privateSyscapLen = contextBufLen - sizeof(PCIDMain) - 1;
     if (privateSyscapLen < 0 || privateSyscapLen > INT32_MAX) {
         PRINT_ERR("parse private syscap failed.");
         return GetPriSyscapResult(capVectorPtr, -1);