diff --git a/beerbox.h b/beerbox.h
index 1ee1182..6a40410 100644
--- a/beerbox.h
+++ b/beerbox.h
@@ -44,8 +44,8 @@ typedef struct{
 
   char file_name[FILE_NAME_LEN + 1];
   char name[NAME_LEN + 1];
-  int rfid_uuid;
-  int finger_uuid;
+  char rfid_uuid[13];
+  uint8_t finger_uuid;
 
   int drinks_taken[NUM_OF_DRINKS];
 
diff --git a/beerbox.ino b/beerbox.ino
index 072db24..186c28e 100644
--- a/beerbox.ino
+++ b/beerbox.ino
@@ -174,9 +174,11 @@ Person read_person(Beerbox *box, char *filename){
 
   read_line_from_file(read, tmp, sizeof(tmp));
   strcpy(aperson.name, tmp);
-
+  
+  memset(aperson.rfid_uuid, 0, 13);
+  
   read_line_from_file(read, tmp, sizeof(tmp));
-  sscanf(tmp, " %*s %d", &aperson.rfid_uuid);
+  sscanf(tmp, " %*s %12s", aperson.rfid_uuid);
   Serial.print(aperson.rfid_uuid);
   
   read_line_from_file(read, tmp, sizeof(tmp));
@@ -231,9 +233,9 @@ void print_person(Beerbox *box, Person *aperson){
   
   sprintf(leckmich,"\nPerson is called \"%s\" and has the filename \"%s\".\n", aperson->name, tmp_filename);
   Serial.write(leckmich);
-  sprintf(leckmich, "rfid_uuid:   %d\n", aperson->rfid_uuid);
+  sprintf(leckmich, "rfid_uuid:   %s\n", aperson->rfid_uuid);
   Serial.write(leckmich);
-  sprintf(leckmich, "finger_uuid: %d\n", aperson->finger_uuid);
+  sprintf(leckmich, "finger_uuid: %u\n", aperson->finger_uuid);
   Serial.print(leckmich);
   
   
@@ -279,9 +281,9 @@ int update_pers_file(Beerbox *box, Person *aperson){
 
   sprintf(leckmich, " %s\n", aperson->name);
   write.write(tmp, strlen(tmp));
-  sprintf(leckmich, "rfid_uuid:   %d\n", aperson->rfid_uuid);
+  sprintf(leckmich, "rfid_uuid:   %s\n", aperson->rfid_uuid);
   write.write(tmp, strlen(tmp));
-  sprintf(leckmich, "finger_uuid: %d\n", aperson->finger_uuid);
+  sprintf(leckmich, "finger_uuid: %u\n", aperson->finger_uuid);
   write.write(tmp, strlen(tmp));
 
   for(i = 0; i < NUM_OF_DRINKS; i++){