diff --git a/lib/flatito/yaml_with_line_number.rb b/lib/flatito/yaml_with_line_number.rb
index e70fbd3..2c0e90b 100644
--- a/lib/flatito/yaml_with_line_number.rb
+++ b/lib/flatito/yaml_with_line_number.rb
@@ -30,8 +30,6 @@ def respond_to_missing?(*)
 
     class ClassLoader < Psych::ClassLoader
       def find(klassname)
-        @cache[klassname] ||= resolve(klassname)
-      rescue ArgumentError
         Whatever.new(klassname)
       end
     end
diff --git a/test/fixtures/with_ruby_objects.yml b/test/fixtures/with_ruby_objects.yml
index b52c464..d667799 100644
--- a/test/fixtures/with_ruby_objects.yml
+++ b/test/fixtures/with_ruby_objects.yml
@@ -3,6 +3,6 @@ two: !ruby/object:OpenStruct
   table:
     one: One
     two: Two
-three: !ruby/object:UnknowClass
+three: !ruby/object:UnknownClass
   one: One
   two: Two
diff --git a/test/flatito/flatten_yaml_test.rb b/test/flatito/flatten_yaml_test.rb
index fba5791..d559775 100644
--- a/test/flatito/flatten_yaml_test.rb
+++ b/test/flatito/flatten_yaml_test.rb
@@ -74,6 +74,10 @@ class Flatito::FlattenYamlTest < Minitest::Test
     assert_equal "two", items[1].key
     assert_equal "[object: OpenStruct]", items[1].value
     assert_equal 2, items[1].line
+
+    assert_equal "three", items[2].key
+    assert_equal "[object: UnknownClass]", items[2].value
+    assert_equal 3, items[2].line
   end
 
   test "items from content with duplicated keys" do