diff --git a/include/asm-i386/mmzone.h b/include/asm-i386/mmzone.h
index 9cec191..48e46d4 100644
--- a/include/asm-i386/mmzone.h
+++ b/include/asm-i386/mmzone.h
@@ -143,4 +143,7 @@
 }
 
 #endif /* CONFIG_DISCONTIGMEM */
+
+extern int early_pfn_to_nid(unsigned long pfn);
+
 #endif /* _ASM_MMZONE_H_ */