diff --git a/core/Messenger.c b/core/Messenger.c
index 2721f8f6..07145416 100644
--- a/core/Messenger.c
+++ b/core/Messenger.c
@@ -751,7 +751,7 @@ void doMessenger(Messenger *m)
 /* returns the size of the messenger data (for saving) */
 uint32_t Messenger_size(Messenger *m)
 {
-    return crypto_box_PUBLICKEYBYTES + crypto_box_SECRETKEYBYTES
+    return crypto_box_PUBLICKEYBYTES + crypto_box_SECRETKEYBYTES + sizeof(uint32_t)
            + sizeof(uint32_t) + DHT_size() + sizeof(uint32_t) + sizeof(Friend) * m->numfriends;
 }