diff --git a/mm/memory.c b/mm/memory.c
index ab3537b..1fcf59a 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -118,6 +118,8 @@
 unsigned long zero_pfn __read_mostly;
 unsigned long highest_memmap_pfn __read_mostly;
 
+EXPORT_SYMBOL(zero_pfn);
+
 /*
  * CONFIG_MMU architectures set up ZERO_PAGE in their paging_init()
  */