diff --git a/src/client/src/tscSql.c b/src/client/src/tscSql.c
index 9799c9129bd4339b675a209aaec915bdf675474d..7c856e6cc307505d2aaad99ad6b0b47a94a27f2e 100644
--- a/src/client/src/tscSql.c
+++ b/src/client/src/tscSql.c
@@ -174,7 +174,7 @@ static void syncConnCallback(void *param, TAOS_RES *tres, int code) {
 TAOS *taos_connect_internal(const char *ip, const char *user, const char *pass, const char *auth, const char *db,
                             uint16_t port) {
   STscObj *pObj = NULL;
-  SSqlObj *pSql = taosConnectImpl(ip, user, pass, auth, db, port, syncConnCallback, NULL, &pObj);
+  SSqlObj *pSql = taosConnectImpl(ip, user, pass, auth, db, port, syncConnCallback, NULL, (void **)&pObj);
   if (pSql != NULL) {
     pSql->fp = syncConnCallback;
     pSql->param = pSql;
@@ -245,11 +245,11 @@ static void asyncConnCallback(void *param, TAOS_RES *tres, int code) {
 TAOS *taos_connect_a(char *ip, char *user, char *pass, char *db, uint16_t port, void (*fp)(void *, TAOS_RES *, int),
                      void *param, TAOS **taos) {
   STscObj *pObj = NULL;
-  SSqlObj* pSql = taosConnectImpl(ip, user, pass, NULL, db, port, asyncConnCallback, param, &pObj);
+  SSqlObj *pSql = taosConnectImpl(ip, user, pass, NULL, db, port, asyncConnCallback, param, (void **)&pObj);
   if (pSql == NULL) {
     return NULL;
   }
- 
+
   if (taos) *taos = pObj;
 
   pSql->fetchFp = fp;
diff --git a/src/inc/taos.h b/src/inc/taos.h
index 66b5f930bca4116ae72c1ee60753e4cc22c3b088..315313734753de73bf477b1f67783a45c38c87c9 100644
--- a/src/inc/taos.h
+++ b/src/inc/taos.h
@@ -22,13 +22,12 @@
 extern "C" {
 #endif
 
-typedef struct STscObj         TAOS;
-typedef struct STscStmt        TAOS_STMT;
-typedef struct SSqlObj         TAOS_RES;
-typedef struct SSqlStream      TAOS_STREAM;
-typedef struct SSub            TAOS_SUB;
-typedef unsigned char**        TAOS_ROW;
-
+typedef void   TAOS;
+typedef void   TAOS_STMT;
+typedef void   TAOS_RES;
+typedef void   TAOS_STREAM;
+typedef void   TAOS_SUB;
+typedef void **TAOS_ROW;
 
 // Data type definition
 #define TSDB_DATA_TYPE_NULL       0     // 1 bytes