diff --git a/src/client/src/tscSystem.c b/src/client/src/tscSystem.c
index d2fcbd1d1e2641b07b0023f5244c8eb3141d27ca..77d668c5af152eb96ae2f0e698b806444faed667 100644
--- a/src/client/src/tscSystem.c
+++ b/src/client/src/tscSystem.c
@@ -159,7 +159,7 @@ void taos_init_imp(void) {
 void taos_init() { pthread_once(&tscinit, taos_init_imp); }
 
 // this function may be called by user or system, or by both simultaneously.
-void taos_cleanup() {
+void taos_cleanup(void) {
   tscDebug("start to cleanup client environment");
 
   void* m = tscMetaCache;
diff --git a/src/inc/taos.h b/src/inc/taos.h
index 315313734753de73bf477b1f67783a45c38c87c9..2c6454ced1911de603f120c79af5237c2f064c48 100644
--- a/src/inc/taos.h
+++ b/src/inc/taos.h
@@ -64,7 +64,7 @@ typedef struct taosField {
 #endif
 
 DLL_EXPORT void  taos_init();
-DLL_EXPORT void  taos_cleanup();
+DLL_EXPORT void  taos_cleanup(void);
 DLL_EXPORT int   taos_options(TSDB_OPTION option, const void *arg, ...);
 DLL_EXPORT TAOS *taos_connect(const char *ip, const char *user, const char *pass, const char *db, uint16_t port);
 DLL_EXPORT void  taos_close(TAOS *taos);