diff --git a/lib/capybara/node/matchers.rb b/lib/capybara/node/matchers.rb
index ccd8f818..099fc879 100644
--- a/lib/capybara/node/matchers.rb
+++ b/lib/capybara/node/matchers.rb
@@ -743,7 +743,7 @@ module Capybara
       end
 
       def assert_no_ancestor(*args, &optional_filter_block)
-        _verify_selector_result(args, optional_filter_block, Capybara::Queries::SiblingQuery) do |result, query|
+        _verify_selector_result(args, optional_filter_block, Capybara::Queries::AncestorQuery) do |result, query|
           if result.matches_count? && (!result.empty? || query.expects_none?)
             raise Capybara::ExpectationNotMet, result.negative_failure_message
           end
diff --git a/lib/capybara/rspec/matchers/base.rb b/lib/capybara/rspec/matchers/base.rb
index 4315e0f8..f5134d7d 100644
--- a/lib/capybara/rspec/matchers/base.rb
+++ b/lib/capybara/rspec/matchers/base.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require 'capybara/rspec/matchers/compound'
+require 'capybara/rspec/matchers/count_sugar'
 
 module Capybara
   module RSpecMatchers
@@ -66,7 +67,7 @@ module Capybara
       end
 
       class CountableWrappedElementMatcher < WrappedElementMatcher
-        include CountSugar
+        include ::Capybara::RSpecMatchers::CountSugar
       end
 
       class NegatedMatcher
diff --git a/lib/capybara/rspec/matchers/have_ancestor.rb b/lib/capybara/rspec/matchers/have_ancestor.rb
index 92c86c81..570f3549 100644
--- a/lib/capybara/rspec/matchers/have_ancestor.rb
+++ b/lib/capybara/rspec/matchers/have_ancestor.rb
@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require 'capybara/rspec/matchers/base'
-require 'capybara/rspec/matchers/count_sugar'
 
 module Capybara
   module RSpecMatchers
diff --git a/lib/capybara/rspec/matchers/have_selector.rb b/lib/capybara/rspec/matchers/have_selector.rb
index 7dc96dd9..bd4def06 100644
--- a/lib/capybara/rspec/matchers/have_selector.rb
+++ b/lib/capybara/rspec/matchers/have_selector.rb
@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require 'capybara/rspec/matchers/base'
-require 'capybara/rspec/matchers/count_sugar'
 
 module Capybara
   module RSpecMatchers
diff --git a/lib/capybara/rspec/matchers/have_sibling.rb b/lib/capybara/rspec/matchers/have_sibling.rb
index 0cebefc2..3ab259f4 100644
--- a/lib/capybara/rspec/matchers/have_sibling.rb
+++ b/lib/capybara/rspec/matchers/have_sibling.rb
@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require 'capybara/rspec/matchers/base'
-require 'capybara/rspec/matchers/count_sugar'
 
 module Capybara
   module RSpecMatchers
diff --git a/lib/capybara/rspec/matchers/have_text.rb b/lib/capybara/rspec/matchers/have_text.rb
index afdce79b..784ef768 100644
--- a/lib/capybara/rspec/matchers/have_text.rb
+++ b/lib/capybara/rspec/matchers/have_text.rb
@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require 'capybara/rspec/matchers/base'
-require 'capybara/rspec/matchers/count_sugar'
 
 module Capybara
   module RSpecMatchers
diff --git a/lib/capybara/spec/session/has_ancestor_spec.rb b/lib/capybara/spec/session/has_ancestor_spec.rb
index 2fdd1aff..8e7fcb06 100644
--- a/lib/capybara/spec/session/has_ancestor_spec.rb
+++ b/lib/capybara/spec/session/has_ancestor_spec.rb
@@ -39,6 +39,8 @@ Capybara::SpecHelper.spec '#have_no_ancestor' do
   it 'should assert no matching ancestor' do
     el = @session.find(:css, '#ancestor1')
     expect(el).to have_no_ancestor(:css, '#child')
+    expect(el).to have_no_ancestor(:css, '#ancestor1_sibiling')
     expect(el).not_to have_ancestor(:css, '#child')
+    expect(el).not_to have_ancestor(:css, '#ancestor1_sibiling')
   end
 end