diff --git a/numeric.c b/numeric.c
index a2c3a4b043..e18333c0e4 100644
--- a/numeric.c
+++ b/numeric.c
@@ -3152,11 +3152,11 @@ Init_Numeric(void)
     rb_define_method(rb_cInteger, "truncate", int_to_i, 0);
     rb_define_method(rb_cInteger, "round", int_round, -1);
 
-    rb_cFixnum = rb_define_class("Fixnum", rb_cInteger);
-
     rb_define_method(rb_cInteger, "numerator", int_numerator, 0);
     rb_define_method(rb_cInteger, "denominator", int_denominator, 0);
 
+    rb_cFixnum = rb_define_class("Fixnum", rb_cInteger);
+
     rb_define_method(rb_cFixnum, "to_s", fix_to_s, -1);
 
     rb_define_method(rb_cFixnum, "-@", fix_uminus, 0);