diff --git a/insns.def b/insns.def
index a4c56159a6..2c0e52ea16 100644
--- a/insns.def
+++ b/insns.def
@@ -306,7 +306,6 @@ putnil
 ()
 (VALUE val)
 {
-fprintf(stderr, "[DEBUG B] reg_cfp:%p reg_cfp->sp:%p\n", reg_cfp, reg_cfp->sp);
     val = Qnil;
 }