1 files changed, 1 insertions, 1 deletions
diff --git a/proc.c b/proc.c
index 76a004dca1..8cf652b191 100644
--- a/proc.c
+++ b/proc.c
@@ -2056,7 +2056,7 @@ rb_method_entry_min_max_arity(const rb_method_entry_t *me, int *max)
       case VM_METHOD_TYPE_BMETHOD:
 	return rb_proc_min_max_arity(def->body.proc, max);
       case VM_METHOD_TYPE_ISEQ: {
-	rb_iseq_t *iseq = def->body.iseq.iseqptr;
+	const rb_iseq_t *iseq = def->body.iseq.iseqptr;
 	return rb_iseq_min_max_arity(iseq, max);
       }
       case VM_METHOD_TYPE_UNDEF: