diff --git a/include/syscap_define.h b/include/syscap_define.h
index 2c5f4828342556cc9cd8eb3032acea610cefe7f6..1c0775eb33c220ffe323eb8d6b943a45ca21bd9e 100644
--- a/include/syscap_define.h
+++ b/include/syscap_define.h
@@ -19,14 +19,18 @@
 #include <stdint.h>
 
 #define SINGLE_SYSCAP_LEN (256 + 17)
-
+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */
 typedef struct SystemCapabilityWithNum {
     char str[SINGLE_SYSCAP_LEN];
     uint16_t num;
 } SyscapWithNum;
 
 /*
- * New syscap index must be added last and
+ * New SyscapNum must be added last and
  * don't delete anyone, just comment after it.
  */
 typedef enum SystemCapabilityNum {
@@ -216,7 +220,7 @@ typedef enum SystemCapabilityNum {
 } SyscapNum;
 
 
-/* sort by enum */
+/* Sort by SyscapNum */
 const static SyscapWithNum g_arraySyscap[] = {
     {"SystemCapability.Account.AppAccount", ACCOUNT_APPACCOUNT},
     {"SystemCapability.Account.OsAccount", ACCOUNT_OSACCOUNT},
@@ -401,4 +405,9 @@ const static SyscapWithNum g_arraySyscap[] = {
     {"SystemCapability.Utils.Lang", UTILS_LANG},
 };
 
+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
 #endif  // _SYSCAP_DEFINE_H
diff --git a/interfaces/inner_api/syscap_interface.c b/interfaces/inner_api/syscap_interface.c
index b55f3563ad2e377a2f7d8ae07b65751855e8def7..6010d1fffde3d1cbfb0794cd2cdeab885bae3261 100644
--- a/interfaces/inner_api/syscap_interface.c
+++ b/interfaces/inner_api/syscap_interface.c
@@ -183,7 +183,7 @@ bool EncodePrivateSyscap(char **output, int *outputLen)
     }
 
     FreeContextBuffer(contextBuffer);
-    *outputLen = strlen(outputStr);
+    *outputLen = (int)strlen(outputStr);
     *output = outputStr;
     return true;
 }