diff --git a/src/filo-fs-ext2.adb b/src/filo-fs-ext2.adb
index 96328dd..3c8578b 100644
--- a/src/filo-fs-ext2.adb
+++ b/src/filo-fs-ext2.adb
@@ -40,7 +40,7 @@
       Success  :    out Boolean)
    is
       Static : Mount_State renames State.Static;
-      Super_Block : Buffer_Type (0 .. SUPERBLOCK_SIZE - 1) := (others => 0);
+      Super_Block : Buffer_Type (0 .. 64 * 4 - 1) := (others => 0);
    begin
       if Part_Len < 2 * SUPERBLOCK_SIZE then
          Success := False;