diff --git a/parser.go b/parser.go
index 53fc986..2a8c01b 100644
--- a/parser.go
+++ b/parser.go
@@ -135,7 +135,7 @@ func expectSeparator(tokens []LexToken, separators ...Separator) (Separator, []L
 
 	separator := tokens[0]
 	if separator.Type != Type_Separator || !slices.Contains(separators, separator.Value.(Separator)) {
-		return InvalidValue, nil, errors.New("expected one of " + strings.Join(separatorNames, ", "))
+		return InvalidValue, nil, errors.New("expected one of " + strings.Join(separatorNames, " "))
 	}
 
 	return separator.Value.(Separator), tokens[1:], nil