diff --git a/components/net/at/src/at_utils.c b/components/net/at/src/at_utils.c
index 7d26425f56101625a4ff4e2caa4b0f7db6c147c4..0c9529771333be3aeec27cc87b26c638dee4c09b 100644
--- a/components/net/at/src/at_utils.c
+++ b/components/net/at/src/at_utils.c
@@ -67,7 +67,7 @@ const char *at_get_last_cmd(rt_size_t *cmd_size)
 
 rt_size_t at_vprintf(rt_device_t device, const char *format, va_list args)
 {
-    last_cmd_len = vsnprintf(send_buf, sizeof(send_buf), format, args);
+    last_cmd_len = rt_vsnprintf(send_buf, sizeof(send_buf), format, args);
 
 #ifdef AT_PRINT_RAW_CMD
     at_print_raw_cmd("sendline", send_buf, last_cmd_len);