diff --git a/src/filo-fs-vfs.ads b/src/filo-fs-vfs.ads
index 5ae086c..55c309a 100644
--- a/src/filo-fs-vfs.ads
+++ b/src/filo-fs-vfs.ads
@@ -59,7 +59,7 @@
 
    function C_Mount return int;
 
-   function C_Open (File_Path : Strings.chars_ptr) return int;
+   function C_Open (File_Path : System.Address) return int;
    procedure C_Close;
    
    function C_Read (Buf : System.Address; Len : int) return int;