diff --git a/include/os/windows/zfs/sys/zfs_context_os.h b/include/os/windows/zfs/sys/zfs_context_os.h
index bcb409205919..2a19883c15dd 100644
--- a/include/os/windows/zfs/sys/zfs_context_os.h
+++ b/include/os/windows/zfs/sys/zfs_context_os.h
@@ -195,10 +195,6 @@ extern void kx_qsort(void *array, size_t nm, size_t member_size,
 
 #define	strstr kmem_strstr
 
-void spa_create_os(void *spa);
-void spa_export_os(void *spa);
-void spa_activate_os(void *spa);
-void spa_deactivate_os(void *spa);
 
 #define	task_io_account_read(n)
 #define	task_io_account_write(n)
diff --git a/module/os/windows/zfs/spa_misc_os.c b/module/os/windows/zfs/spa_misc_os.c
index d75e3cd29fa5..97c6eee4887b 100644
--- a/module/os/windows/zfs/spa_misc_os.c
+++ b/module/os/windows/zfs/spa_misc_os.c
@@ -54,23 +54,23 @@ spa_history_zone(void)
 }
 
 void
-spa_create_os(void *arg)
+spa_import_os(spa_t *arg)
 {
 }
 
 void
-spa_export_os(void *arg)
+spa_export_os(spa_t *arg)
 {
 }
 
 void
-spa_activate_os(void *arg)
+spa_activate_os(spa_t *arg)
 {
 	atomic_inc_64(&zfs_module_busy);
 }
 
 void
-spa_deactivate_os(void *arg)
+spa_deactivate_os(spa_t *arg)
 {
 	atomic_dec_64(&zfs_module_busy);
 }