diff --git a/mm/nommu.c b/mm/nommu.c
index cbbc137..1f60194 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -45,6 +45,7 @@
 
 EXPORT_SYMBOL(mem_map);
 EXPORT_SYMBOL(__vm_enough_memory);
+EXPORT_SYMBOL(num_physpages);
 
 /* list of shareable VMAs */
 struct rb_root nommu_vma_tree = RB_ROOT;