diff --git a/thread.c b/thread.c
index e672172a4d..9400c32adc 100644
--- a/thread.c
+++ b/thread.c
@@ -5297,7 +5297,7 @@ rb_exec_recursive_paired(VALUE (*func) (VALUE, VALUE, int), VALUE obj, VALUE pai
 
 /*
  * If recursion is detected on the current method and obj, the outermost
- * func will be called with (obj, arg, Qtrue). All inner func will be
+ * func will be called with (obj, arg, true). All inner func will be
  * short-circuited using throw.
  */