diff --git a/error.c b/error.c
index cc861e08b0..ba0f258f0d 100644
--- a/error.c
+++ b/error.c
@@ -766,7 +766,7 @@ die(void)
 }
 
 void
-rb_bug_without_die(const char *fmt, ...)
+rb_bug_without_die(const char *fmt, va_list args)
 {
     const char *file = NULL;
     int line = 0;
@@ -775,7 +775,7 @@ rb_bug_without_die(const char *fmt, ...)
         file = rb_source_location_cstr(&line);
     }
 
-    report_bug(file, line, fmt, NULL);
+    report_bug_valist(file, line, fmt, NULL, args);
 }
 
 void