diff --git a/internal/buffer/buffer.go b/internal/buffer/buffer.go
index ad359b8a18..ac5dc5986a 100644
--- a/internal/buffer/buffer.go
+++ b/internal/buffer/buffer.go
@@ -666,7 +666,11 @@ func calcHash(b *Buffer, out *[md5.Size]byte) error {
 		size += n
 
 		for _, l := range b.lines[1:] {
-			n, _ = h.Write([]byte{'\n'})
+			if b.Endings == FFDos {
+				n, _ = h.Write([]byte{'\r', '\n'})
+			} else {
+				n, _ = h.Write([]byte{'\n'})
+			}
 			size += n
 			n, _ = h.Write(l.data)
 			size += n