diff --git a/filesetup.c b/filesetup.c
index 37ea752..9f186fb 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -355,7 +355,8 @@
 
 	if (f->file_offset > f->real_file_size) {
 		log_err("%s: offset extends end (%llu > %llu)\n", td->o.name,
-					f->file_offset, f->real_file_size);
+					(unsigned long long) f->file_offset,
+					(unsigned long long) f->real_file_size);
 		return 1;
 	}