Fix "go vet" issue

1 files changed, 1 insertions, 1 deletions

diff --git a/conf/scanner.go b/conf/scanner.go
index 9bd7a4b..fd9868a 100644
--- a/conf/scanner.go
+++ b/conf/scanner.go
@@ -61,7 +61,7 @@ func (s *scanner) Scan() (token, error) {
 		r, rlen := utf8.DecodeRune(s.data[s.offset+processed:])
 		if r == utf8.RuneError {
 			if rlen == 1 {
-				return token{}, fmt.Errorf("found invalid UTF8 at offset %d, before: %s", s.offset, s.data[s.offset])
+				return token{}, fmt.Errorf("found invalid UTF8 at offset %d, before: %s", s.offset, string(s.data[s.offset]))
 			} else if rlen == 0 {
 				return token{}, io.EOF
 			}