diff --git a/numeric.c b/numeric.c
index 3c380cb76b..01f9f45420 100644
--- a/numeric.c
+++ b/numeric.c
@@ -230,10 +230,7 @@ rb_num_get_rounding_option(VALUE opts)
 	    break;
 	}
       invalid:
-	if (NIL_P(rounding))
-	    rb_raise(rb_eArgError, "invalid rounding mode: nil");
-	else
-	    rb_raise(rb_eArgError, "invalid rounding mode: % "PRIsVALUE, rounding);
+	rb_raise(rb_eArgError, "invalid rounding mode: % "PRIsVALUE, rounding);
     }
   noopt:
     return RUBY_NUM_ROUND_DEFAULT;