diff --git a/include/asm-alpha/mmzone.h b/include/asm-alpha/mmzone.h
index c900439..192d80c 100644
--- a/include/asm-alpha/mmzone.h
+++ b/include/asm-alpha/mmzone.h
@@ -83,8 +83,7 @@
 	pte_t pte;                                                           \
 	unsigned long pfn;                                                   \
 									     \
-	pfn = ((unsigned long)((page)-page_zone(page)->zone_mem_map)) << 32; \
-	pfn += page_zone(page)->zone_start_pfn << 32;			     \
+	pfn = page_to_pfn(page) << 32; \
 	pte_val(pte) = pfn | pgprot_val(pgprot);			     \
 									     \
 	pte;								     \