--- a/usr/src/uts/common/fs/zfs/zvol.c	Thu Nov 09 08:35:31 2006 -0800
+++ b/usr/src/uts/common/fs/zfs/zvol.c	Thu Nov 09 11:33:08 2006 -0800
@@ -1028,7 +1028,7 @@
 			gpt.efi_gpt_LastUsableLBA =
 			    LE_64((zv->zv_volsize >> zv->zv_min_bs) - 1);
 			gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1);
-			gpt.efi_gpt_PartitionEntryLBA = LE_32(2);
+			gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL);
 			gpt.efi_gpt_SizeOfPartitionEntry = LE_32(sizeof (gpe));
 
 			UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid);