diff --git a/[refs] b/[refs]
index f6c8873a55ad..c526a74257c2 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 40dbb8676ed0d4c7a40596c7ef8c1c7acde9d972
+refs/heads/master: 52c7378236103ce5fbfb7b3e6ac46aa9de9f970d
diff --git a/trunk/arch/um/drivers/cow.h b/trunk/arch/um/drivers/cow.h
index 04e3958266e0..dc36b222100b 100644
--- a/trunk/arch/um/drivers/cow.h
+++ b/trunk/arch/um/drivers/cow.h
@@ -46,7 +46,7 @@ extern int file_reader(__u64 offset, char *buf, int len, void *arg);
 extern int read_cow_header(int (*reader)(__u64, char *, int, void *),
 			   void *arg, __u32 *version_out,
 			   char **backing_file_out, time_t *mtime_out,
-			   __u64 *size_out, int *sectorsize_out,
+			   unsigned long long *size_out, int *sectorsize_out,
 			   __u32 *align_out, int *bitmap_offset_out);
 
 extern int write_cow_header(char *cow_file, int fd, char *backing_file,
diff --git a/trunk/arch/um/drivers/cow_sys.h b/trunk/arch/um/drivers/cow_sys.h
index 94de4ead4f7a..7a5b4afde692 100644
--- a/trunk/arch/um/drivers/cow_sys.h
+++ b/trunk/arch/um/drivers/cow_sys.h
@@ -28,7 +28,7 @@ static inline int cow_seek_file(int fd, __u64 offset)
 	return(os_seek_file(fd, offset));
 }
 
-static inline int cow_file_size(char *file, __u64 *size_out)
+static inline int cow_file_size(char *file, unsigned long long *size_out)
 {
 	return(os_file_size(file, size_out));
 }