Index: moo/cow.c
===================================================================
--- moo/cow.c
+++ moo/cow.c	2006-08-09 18:14:48.091684459 +0200
@@ -265,7 +265,7 @@
 
 int read_cow_header(int (*reader)(__u64, char *, int, void *), void *arg,
 		    __u32 *version_out, char **backing_file_out,
-		    time_t *mtime_out, unsigned long long *size_out,
+		    time_t *mtime_out, __u64 *size_out,
 		    int *sectorsize_out, __u32 *align_out,
 		    int *bitmap_offset_out)
 {