diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c
index e759109..71ecbb3 100644
--- a/arch/x86_64/mm/init.c
+++ b/arch/x86_64/mm/init.c
@@ -498,6 +498,7 @@
 {
 	return 0;
 }
+EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 #endif
 
 #else /* CONFIG_MEMORY_HOTPLUG */