diff --git a/mrbgems/mruby-numeric-ext/test/numeric.rb b/mrbgems/mruby-numeric-ext/test/numeric.rb
index be8bf9b97..0da071f26 100644
--- a/mrbgems/mruby-numeric-ext/test/numeric.rb
+++ b/mrbgems/mruby-numeric-ext/test/numeric.rb
@@ -36,8 +36,12 @@ assert('Integer#ceildiv') do
   assert_equal(-1, -4.ceildiv(3))
   assert_equal(2, -4.ceildiv(-3))
 
-#  assert_equal(3, 3.ceildiv(1.2))
-#  assert_equal(3, 3.ceildiv(6/5r))
+  if Object.const_defined?(:Float)
+    assert_equal(3, 3.ceildiv(1.2))
+  end
+  if Object.const_defined?(:Rational)
+    assert_equal(3, 3.ceildiv(6/5r))
+  end
 
 #  assert_equal(10, (10**100-11).ceildiv(10**99-1))
 #  assert_equal(11, (10**100-9).ceildiv(10**99-1))