Index: stand/common/disk.h
===================================================================
--- stand/common/disk.h
+++ stand/common/disk.h
@@ -116,7 +116,7 @@
  * Print information about slices on a disk.
  */
 extern int disk_print(struct disk_devdesc *, char *, int);
-extern char* disk_fmtdev(struct disk_devdesc *);
+extern char *disk_fmtdev(void *vdev);
 extern int disk_parsedev(struct disk_devdesc *, const char *, const char **);
 
 #endif	/* _DISK_H */
Index: stand/common/disk.c
===================================================================
--- stand/common/disk.c
+++ stand/common/disk.c
@@ -386,8 +386,9 @@
 }
 
 char *
-disk_fmtdev(struct disk_devdesc *dev)
+disk_fmtdev(void *vdev)
 {
+	struct disk_devdesc *dev = (struct disk_devdesc *)vdev;
 	static char buf[128];
 	char *cp;