diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index a1d989e25..c284ff215 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -1837,6 +1837,10 @@ module ApplicationHelper
   end
 
   def render_if_exist(options = {}, locals = {}, &block)
+    # Remove test_redner_if_exist_should_be_render_partial and test_redner_if_exist_should_be_render_nil
+    # along with this method in Redmine 7.0
+    ActiveSupport::Deprecation.warn 'ApplicationHelper#render_if_exist is deprecated and will be removed in Redmine 7.0.'
+
     if options[:partial]
       if lookup_context.exists?(options[:partial], lookup_context.prefixes, true)
         render(options, locals, &block)
diff --git a/test/helpers/application_helper_test.rb b/test/helpers/application_helper_test.rb
index 180066b17..e46392cd6 100644
--- a/test/helpers/application_helper_test.rb
+++ b/test/helpers/application_helper_test.rb
@@ -2186,14 +2186,26 @@ class ApplicationHelperTest < Redmine::HelperTest
     assert_match(/name="new_issue-[a-z0-9]{8}"/, labelled_form_for(Issue.new){})
   end
 
+  # TODO: Remove this test when ApplicationHelper#render_if_exist is removed
   def test_redner_if_exist_should_be_render_partial
+    saved_behavior = ActiveSupport::Deprecation.behavior
+    ActiveSupport::Deprecation.behavior = :silence
+
     controller.prepend_view_path "test/fixtures/views"
     assert_equal "partial html\n", render_if_exist(:partial => 'partial')
+  ensure
+    ActiveSupport::Deprecation.behavior = saved_behavior
   end
 
+  # TODO: Remove this test when ApplicationHelper#render_if_exist is removed
   def test_redner_if_exist_should_be_render_nil
+    saved_behavior = ActiveSupport::Deprecation.behavior
+    ActiveSupport::Deprecation.behavior = :silence
+
     controller.prepend_view_path "test/fixtures/views"
     assert_nil render_if_exist(:partial => 'non_exist_partial')
+  ensure
+    ActiveSupport::Deprecation.behavior = saved_behavior
   end
 
   def test_export_csv_encoding_select_tag_should_return_nil_when_general_csv_encoding_is_UTF8