diff --git a/src/eap_peer/eap_tnc.c b/src/eap_peer/eap_tnc.c
index 25b9f1248..4541b2365 100644
--- a/src/eap_peer/eap_tnc.c
+++ b/src/eap_peer/eap_tnc.c
@@ -10,6 +10,7 @@
 
 #include "common.h"
 #include "eap_i.h"
+#include "eap_config.h"
 #include "tncc.h"
 
 
@@ -35,12 +36,16 @@ struct eap_tnc_data {
 static void * eap_tnc_init(struct eap_sm *sm)
 {
 	struct eap_tnc_data *data;
+	struct eap_peer_config *config = eap_get_config(sm);
 
 	data = os_zalloc(sizeof(*data));
 	if (data == NULL)
 		return NULL;
 	data->state = WAIT_START;
-	data->fragment_size = 1300;
+	if (config && config->fragment_size)
+		data->fragment_size = config->fragment_size;
+	else
+		data->fragment_size = 1300;
 	data->tncc = tncc_init();
 	if (data->tncc == NULL) {
 		os_free(data);