1 files changed, 1 insertions, 1 deletions
diff --git a/error.c b/error.c
index c420aaca3c..35e797f5b9 100644
--- a/error.c
+++ b/error.c
@@ -1273,7 +1273,7 @@ check_highlight_keyword(VALUE opt, int auto_tty_detect)
 
         switch (highlight) {
           default:
-            rb_bool_expected(highlight, "highlight");
+            rb_bool_expected(highlight, "highlight", TRUE);
             UNREACHABLE;
           case Qtrue: case Qfalse: case Qnil: break;
         }