diff --git a/stand/libsa/open.c b/stand/libsa/open.c
index 63008d0928dc..d1f1fcf9bb4d 100644
--- a/stand/libsa/open.c
+++ b/stand/libsa/open.c
@@ -103,11 +103,11 @@ open(const char *fname, int mode)
 
 	f = &files[fd];
 	f->f_flags = mode + 1;
-	f->f_dev = (struct devsw *)0;
-	f->f_ops = (struct fs_ops *)0;
+	f->f_dev = NULL;
+	f->f_ops = NULL;
 	f->f_offset = 0;
 	f->f_devdata = NULL;
-	file = (char *)0;
+	file = NULL;
 
 	if (exclusive_file_system != NULL) {
 		fs = exclusive_file_system;
@@ -119,11 +119,11 @@ open(const char *fname, int mode)
 
 	error = devopen(f, fname, &file);
 	if (error ||
-	    (((f->f_flags & F_NODEV) == 0) && f->f_dev == (struct devsw *)0))
+	    (((f->f_flags & F_NODEV) == 0) && f->f_dev == NULL))
 		goto err;
 
 	/* see if we opened a raw device; otherwise, 'file' is the file name. */
-	if (file == (char *)0 || *file == '\0') {
+	if (file == NULL || *file == '\0') {
 		f->f_flags |= F_RAW;
 		f->f_rabuf = NULL;
 		return (fd);