diff --git a/terminal/runereader_posix.go b/terminal/runereader_posix.go
index e16a91b4..aa71a9f0 100644
--- a/terminal/runereader_posix.go
+++ b/terminal/runereader_posix.go
@@ -77,7 +77,7 @@ func (rr *RuneReader) ReadRune() (rune, int, error) {
 			return r, size, err
 		}
 		if r != '[' && r != 'O' {
-			return r, size, fmt.Errorf("unexpected Escape Sequence: %q", []rune{'\033', r})
+			return r, size, fmt.Errorf("Unexpected Escape Sequence: %q", []rune{'\033', r})
 		}
 		r, size, err = rr.state.reader.ReadRune()
 		if err != nil {
@@ -105,7 +105,6 @@ func (rr *RuneReader) ReadRune() (rune, int, error) {
 			rr.state.reader.Discard(1)
 			return IgnoreKey, 1, nil
 		}
-		return r, size, fmt.Errorf("unknown Escape Sequence: %q", []rune{'\033', '[', r})
 	}
 	return r, size, err
 }