diff --git a/include/syscap_define.h b/include/syscap_define.h
index 127b653..d7ceb8f 100644
--- a/include/syscap_define.h
+++ b/include/syscap_define.h
@@ -18,7 +18,7 @@
 
 typedef struct SystemCapabilityWithNum {
     char syscapStr[128];
-    int num;
+    uint16_t num;
 } SyscapWithNum;
 
 /* sort by alphabet */
diff --git a/src/create_pcid.c b/src/create_pcid.c
index aceb232..35f20bc 100644
--- a/src/create_pcid.c
+++ b/src/create_pcid.c
@@ -599,7 +599,7 @@ static int32_t AddOsSyscapToJsonObj(uint32_t *osSyscapArray, uint32_t osSyscapAr
 
     uint32_t i, j;
     uint32_t osSyscapCount = 0;
-    int32_t index[BYTES_OF_OS_SYSCAP * UINT8_BIT] = {0};
+    uint16_t index[BYTES_OF_OS_SYSCAP * UINT8_BIT] = {0};
     for (i = 0; i < BYTES_OF_OS_SYSCAP; i++) {
         for (j = 0; j < UINT8_BIT; j++) {
             if (osSysCapArrayUint8[i] & (0x01 << j)) {