--- a/src/lde.h
+++ b/src/lde.h
@@ -211,7 +211,7 @@ struct fs_constants {
 };
 
 /* File system specific commands */
-struct {
+struct _FS_cmd {
   /* Check if inode is marked in use */
   int (*inode_in_use)(unsigned long n);
   /* Check if data zone/block is marked in use */
@@ -231,7 +231,9 @@ struct {
   unsigned long (*map_inode)(unsigned long n);
   /* Map block number in file chain to physical block on disk */
   int (*map_block)(unsigned long zone_index[], unsigned long blknr, unsigned long *mapped_block);
-} FS_cmd;
+};
+
+extern struct _FS_cmd FS_cmd;
 
 /* Flags */
 struct _lde_flags {
--- a/src/main_lde.c
+++ b/src/main_lde.c
@@ -90,6 +90,7 @@ int  (*mgetch)(void) = tty_mgetch;
 
 struct _lde_typedata lde_typedata[] = LDE_ALLTYPES;
 
+struct _FS_cmd FS_cmd;
 
 /* Check if device is mounted, return 1 if is mounted else 0 */
 static int check_mount(char *device_name)