diff --git a/kni_intercept.c b/kni_intercept.c
index a1d8e08..6dc4eab 100644
--- a/kni_intercept.c
+++ b/kni_intercept.c
@@ -866,7 +866,7 @@ int kni_process_writedata(int thread_seq)
 }
 
 
-int tun_read_data(int fd,char* recv_buf,int max_buflen)
+int tun_read_data(int fd, char* buffer, size_t size)
 {
 	int recv_len=0;
 
@@ -893,7 +893,7 @@ int tun_read_data(int fd,char* recv_buf,int max_buflen)
 		}
 	}
 	
-	recv_len = read(fd, recv_buf, KNI_MAX_BUFLEN);
+	recv_len = read(fd, buffer, size);
 	if(recv_len <0)
 	{
 //		MESA_handle_runtime_log(g_kni_comminfo.logger, RLOG_LV_FATAL,KNI_MODULE_WRITETUN,"tun_read_data error %d, %s\n",errno,strerror(errno));