diff --git a/CHANGELOG.md b/CHANGELOG.md
index 70c7173..12340a0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 5.0.2 (unreleased)
+
+- Fixed index name for inherited models
+
 ## 5.0.1 (2022-02-27)
 
 - Prefer `mode: :async` over `async: true` for full reindex
diff --git a/lib/searchkick/model.rb b/lib/searchkick/model.rb
index eeda4c1..c7daef1 100644
--- a/lib/searchkick/model.rb
+++ b/lib/searchkick/model.rb
@@ -88,9 +88,9 @@ module Searchkick
               if options[:index_name]
                 options[:index_name]
               elsif options[:index_prefix].respond_to?(:call)
-                -> { [options[:index_prefix].call, model_name.plural, Searchkick.env, Searchkick.index_suffix].compact.join("_") }
+                -> { [options[:index_prefix].call, searchkick_klass.model_name.plural, Searchkick.env, Searchkick.index_suffix].compact.join("_") }
               else
-                [options.key?(:index_prefix) ? options[:index_prefix] : Searchkick.index_prefix, model_name.plural, Searchkick.env, Searchkick.index_suffix].compact.join("_")
+                [options.key?(:index_prefix) ? options[:index_prefix] : Searchkick.index_prefix, searchkick_klass.model_name.plural, Searchkick.env, Searchkick.index_suffix].compact.join("_")
               end
             end
           end
diff --git a/test/inheritance_test.rb b/test/inheritance_test.rb
index b0b34f3..9594b65 100644
--- a/test/inheritance_test.rb
+++ b/test/inheritance_test.rb
@@ -13,7 +13,7 @@ class InheritanceTest < Minitest::Test
   end
 
   def test_child_index_name
-    assert_equal "animals-#{Date.today.year}#{ENV["TEST_ENV_NUMBER"]}", Dog.searchkick_index.name
+    assert_equal "animals_test#{ENV["TEST_ENV_NUMBER"]}", Dog.searchkick_index.name
   end
 
   def test_child_search
diff --git a/test/models/animal.rb b/test/models/animal.rb
index 2a785d3..7e0668e 100644
--- a/test/models/animal.rb
+++ b/test/models/animal.rb
@@ -2,6 +2,5 @@ class Animal
   searchkick \
     inheritance: true,
     text_start: [:name],
-    suggest: [:name],
-    index_name: -> { "#{name.tableize}-#{Date.today.year}#{Searchkick.index_suffix}" }
+    suggest: [:name]
 end
--
libgit2 0.21.0