diff --git a/src/fs-filo.ads b/src/fs-filo.ads
index fb836fc..d8b5998 100644
--- a/src/fs-filo.ads
+++ b/src/fs-filo.ads
@@ -8,7 +8,7 @@
    type Partition_Length is range 0 .. Interfaces.Unsigned_64'Last;
 
    type File_Length is range 0 .. int'Last; -- Should be higher, fix FILO first
-   subtype File_Offset is File_Length range 0 .. File_Length'Last - 1;
+   subtype File_Offset is File_Length;
 
 private
    function Part_Len return Partition_Length;