1 files changed, 1 insertions, 1 deletions

diff --git a/arch/um/drivers/cow_sys.h b/arch/um/drivers/cow_sys.h
index 94de4ead4f7a..7a5b4afde692 100644
--- a/arch/um/drivers/cow_sys.h
+++ b/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));
 }