diff --git a/libntfs-3g/attrib.c b/libntfs-3g/attrib.c
index f870e6cb..acec8434 100644
--- a/libntfs-3g/attrib.c
+++ b/libntfs-3g/attrib.c
@@ -4180,8 +4180,9 @@ retry:
 				memmove((u8*)a + le16_to_cpu(a->name_offset) -
 					8, (u8*)a + le16_to_cpu(a->name_offset),
 					a->name_length * sizeof(ntfschar));
-				a->name_offset = cpu_to_le16(le16_to_cpu(
-							a->name_offset) - 8);
+				if (le16_to_cpu(a->name_offset) >= 8)
+					a->name_offset = cpu_to_le16(
+						le16_to_cpu(a->name_offset) - 8);
 				a->mapping_pairs_offset =
 						cpu_to_le16(le16_to_cpu(
 						a->mapping_pairs_offset) - 8);