diff --git a/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationBrowser.php b/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationBrowser.php
index 462646a..68e1b10 100644
--- a/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationBrowser.php
+++ b/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationBrowser.php
@@ -40,6 +40,10 @@ public function getLangcode(Request $request = NULL) {
       $langcodes = array_keys($this->languageManager->getLanguages());
       $mappings = $this->config->get('language.mappings')->get();
       $langcode = UserAgent::getBestMatchingLangcode($http_accept_language, $langcodes, $mappings);
+      // Internal page cache with multiple languages and browser negotiation
+      // could lead to wrong cached sites. Therefore disabling the internal
+      // page cache.
+      \Drupal::service('page_cache_kill_switch')->trigger();
     }
 
     return $langcode;