diff --git a/typo3/sysext/backend/Classes/Backend/ToolbarItems/ShortcutToolbarItem.php b/typo3/sysext/backend/Classes/Backend/ToolbarItems/ShortcutToolbarItem.php
index ed27b3e94fcf7da554b7a4c1b6e2b050e5a34687..1457ea49a23df43954b92f7ef1a349e8cbc38fe2 100644
--- a/typo3/sysext/backend/Classes/Backend/ToolbarItems/ShortcutToolbarItem.php
+++ b/typo3/sysext/backend/Classes/Backend/ToolbarItems/ShortcutToolbarItem.php
@@ -793,7 +793,7 @@ class ShortcutToolbarItem implements ToolbarItemInterface
         } else {
             $response->getBody()->write('failed');
         }
-        return $response->withHeader('Content-Type', 'html');
+        return $response->withHeader('Content-Type', 'text/html; charset=utf-8');
     }
 
     /**
diff --git a/typo3/sysext/opendocs/Classes/Backend/ToolbarItems/OpendocsToolbarItem.php b/typo3/sysext/opendocs/Classes/Backend/ToolbarItems/OpendocsToolbarItem.php
index 738cdb07e03c8035d5d72033056624816d59e27b..cf8246804f809f7c108909fa034f97f0eee3ae61 100644
--- a/typo3/sysext/opendocs/Classes/Backend/ToolbarItems/OpendocsToolbarItem.php
+++ b/typo3/sysext/opendocs/Classes/Backend/ToolbarItems/OpendocsToolbarItem.php
@@ -286,7 +286,7 @@ class OpendocsToolbarItem implements ToolbarItemInterface
     public function renderMenu(ServerRequestInterface $request, ResponseInterface $response)
     {
         $response->getBody()->write($this->getDropDown());
-        $response = $response->withHeader('Content-Type', 'html');
+        $response = $response->withHeader('Content-Type', 'text/html; charset=utf-8');
         return $response;
     }