diff --git a/pkg/asciisanitizer/sanitizer.go b/pkg/asciisanitizer/sanitizer.go
index ee3b07b..e54811e 100644
--- a/pkg/asciisanitizer/sanitizer.go
+++ b/pkg/asciisanitizer/sanitizer.go
@@ -47,7 +47,7 @@ func (t *Sanitizer) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err
 			return
 		}
 		r, size := utf8.DecodeRune(src)
-		if r == utf8.RuneError {
+		if r == utf8.RuneError && size < 2 {
 			if !atEOF {
 				err = transform.ErrShortSrc
 				return