diff --git a/drivers/nvme/nvme.asm b/drivers/nvme/nvme.asm
index 7de2678..0c88d7a 100644
--- a/drivers/nvme/nvme.asm
+++ b/drivers/nvme/nvme.asm
@@ -325,7 +325,7 @@ proc build_prp_list stdcall, nprps:dword, buf:dword, prp_list_ptr:dword
 	mov 	eax, esi
 	invoke  GetPhysAddr
 	mov 	dword [edi + ecx * 8], eax
-	mov 	dword [edi + ecx * 8 - 4], 0
+	mov 	dword [edi + ecx * 8 + 4], 0
 	add 	esi, PAGE_SIZE
 	inc 	ecx
 	cmp 	ecx, ebx
@@ -416,6 +416,11 @@ proc alloc_dptr stdcall, ns:dword, prps_ptr:dword, numsectors:dword, prp_list_pt
 	mov 	eax, [numsectors]
 	xor 	edx, edx
 	div 	ecx
+	test 	[buf], PAGE_SIZE - 1
+	jz 	@f
+	inc 	eax
+
+@@:
 	stdcall build_prp_list, eax, ebx, [prp_list_ptr]
 	test 	eax, eax
 	jz 	.err