diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index a9828d7..3c7b947 100644
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -768,7 +768,7 @@
 		initrd_start = ramdisk_image;
 		initrd_end = ramdisk_image + sparc_ramdisk_size;
 
-		lmb_reserve(initrd_start, initrd_end);
+		lmb_reserve(initrd_start, sparc_ramdisk_size);
 
 		initrd_start += PAGE_OFFSET;
 		initrd_end += PAGE_OFFSET;