diff --git a/src/gnss.c b/src/gnss.c
index 6503943..a43827a 100644
--- a/src/gnss.c
+++ b/src/gnss.c
@@ -327,7 +327,7 @@ static void init_assistance_data_upload(struct EG25Manager *manager)
 static void upload_assistance_data(struct EG25Manager *manager)
 {
     gint error;
-    glong written_total = 0;
+    off_t written_total = 0;
     gint ret;
     struct stat sb;