diff --git a/sys/contrib/openzfs/include/sys/spa.h b/sys/contrib/openzfs/include/sys/spa.h
--- a/sys/contrib/openzfs/include/sys/spa.h
+++ b/sys/contrib/openzfs/include/sys/spa.h
@@ -1210,7 +1210,7 @@
 /* Initialization and termination */
 extern void spa_init(spa_mode_t mode);
 extern void spa_fini(void);
-extern void spa_boot_init(void);
+extern void spa_boot_init(void *);
 
 /* properties */
 extern int spa_prop_set(spa_t *spa, nvlist_t *nvp);
diff --git a/sys/contrib/openzfs/module/zfs/spa_misc.c b/sys/contrib/openzfs/module/zfs/spa_misc.c
--- a/sys/contrib/openzfs/module/zfs/spa_misc.c
+++ b/sys/contrib/openzfs/module/zfs/spa_misc.c
@@ -2521,7 +2521,7 @@
 }
 
 void
-spa_boot_init(void)
+spa_boot_init(void *dummy __unused)
 {
 	spa_config_load();
 }