diff --git a/app/finders/config_backups/known_filenames.rb b/app/finders/config_backups/known_filenames.rb
index 6dc9f38f..f93503f5 100644
--- a/app/finders/config_backups/known_filenames.rb
+++ b/app/finders/config_backups/known_filenames.rb
@@ -3,7 +3,7 @@ module WPScan
     module ConfigBackups
       # Config Backup finder
       class KnownFilenames < CMSScanner::Finders::Finder
-        include CMSScanner::Finders::Finder::Enumerator
+        include Finders::Finder::Enumerator
 
         # @param [ Hash ] opts
         # @option opts [ String ] :list
@@ -14,15 +14,20 @@ module WPScan
           found = []
 
           enumerate(potential_urls(opts), opts) do |res|
-            # Might need to improve that
-            next unless res.body =~ /define/i && res.body !~ /<\s?html/i
-
             found << WPScan::ConfigBackup.new(res.request.url, found_by: DIRECT_ACCESS, confidence: 100)
           end
 
           found
         end
 
+        def valid_response?(res, _exclude_content = nil)
+          return unless res.code == 200
+
+          full_res = Browser.get(res.effective_url)
+
+          full_res.body =~ /define/i && full_res.body !~ /<\s?html/i
+        end
+
         # @param [ Hash ] opts
         # @option opts [ String ] :list Mandatory
         #
diff --git a/spec/app/finders/config_backups/known_filenames_spec.rb b/spec/app/finders/config_backups/known_filenames_spec.rb
index ba8c97a7..c1abdaa0 100644
--- a/spec/app/finders/config_backups/known_filenames_spec.rb
+++ b/spec/app/finders/config_backups/known_filenames_spec.rb
@@ -8,10 +8,10 @@ describe WPScan::Finders::ConfigBackups::KnownFilenames do
   describe '#aggressive' do
     before do
       expect(target).to receive(:sub_dir).at_least(1).and_return(false)
-      expect(target).to receive(:homepage_or_404?).at_least(1).and_return(false)
+      expect(target).to receive(:head_or_get_request_params).and_return(method: :head)
 
       finder.potential_urls(opts).each_key do |url|
-        stub_request(:get, url).to_return(status: 404)
+        stub_request(:head, url).to_return(status: 404)
       end
     end
 
@@ -22,11 +22,12 @@ describe WPScan::Finders::ConfigBackups::KnownFilenames do
     end
 
     context 'when some files exist' do
-      let(:files) { ['%23wp-config.php%23', 'wp-config.bak'] }
+      let(:found_files) { ['%23wp-config.php%23', 'wp-config.bak'] }
       let(:config_backup) { File.read(fixtures.join('wp-config.php')) }
 
       before do
-        files.each do |file|
+        found_files.each do |file|
+          stub_request(:head, "#{url}#{file}").to_return(status: 200)
           stub_request(:get, "#{url}#{file}").to_return(body: config_backup)
         end
       end
@@ -34,7 +35,7 @@ describe WPScan::Finders::ConfigBackups::KnownFilenames do
       it 'returns the expected Array<ConfigBackup>' do
         expected = []
 
-        files.each do |file|
+        found_files.each do |file|
           url = "#{target.url}#{file}"
           expected << WPScan::ConfigBackup.new(
             url,