diff --git a/src/chat.c b/src/chat.c
index 2921690..8d9e7bb 100644
--- a/src/chat.c
+++ b/src/chat.c
@@ -228,6 +228,8 @@ static void chat_onFileSendRequest(ToxWindow *self, Tox *m, int32_t num, uint8_t
     uint8_t msg[MAX_STR_SIZE];
     uint8_t *errmsg;
 
+    pathname[path_len] = '\0';
+
     uint8_t filename[MAX_STR_SIZE];
     get_file_name(pathname, filename);