diff --git a/sys/net/gnrc/application_layer/tftp/gnrc_tftp.c b/sys/net/gnrc/application_layer/tftp/gnrc_tftp.c
index d56d2c3a03..0958a59887 100644
--- a/sys/net/gnrc/application_layer/tftp/gnrc_tftp.c
+++ b/sys/net/gnrc/application_layer/tftp/gnrc_tftp.c
@@ -406,6 +406,7 @@ int gnrc_tftp_server(tftp_data_cb_t data_cb, tftp_start_cb_t start_cb, tftp_stop
 
     /* context will be initialized when a connection is established */
     tftp_context_t ctxt = {
+        .src_port = GNRC_TFTP_DEFAULT_DST_PORT,
         .data_cb = data_cb,
         .start_cb = start_cb,
         .stop_cb = stop_cb,