diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index a7fb2429ec..b218a96e6b 100644
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -4004,9 +4004,9 @@ arc_all_memory(void)
 {
 #ifdef _KERNEL
 #ifdef CONFIG_HIGHMEM
-	return (ptob(totalram_pages - totalhigh_pages));
+	return (ptob(zfs_totalram_pages - totalhigh_pages));
 #else
-	return (ptob(totalram_pages));
+	return (ptob(zfs_totalram_pages));
 #endif /* CONFIG_HIGHMEM */
 #else
 	return (ptob(physmem) / 2);