diff --git a/apps/contacts/ajax/savecrop.php b/apps/contacts/ajax/savecrop.php
index f9a32bc3ba43827c4a4b3e554bed3a2f65b57dad..1df5299c7a699e6b697106cde263b1f4b0d4e847 100644
--- a/apps/contacts/ajax/savecrop.php
+++ b/apps/contacts/ajax/savecrop.php
@@ -25,7 +25,7 @@ OCP\JSON::checkAppEnabled('contacts');
 OCP\JSON::callCheck();
 
 // Firefox and Konqueror tries to download application/json for me.  --Arthur
-OCP\JSON::setContentTypeHeader('text/plain');
+OCP\JSON::setContentTypeHeader('text/plain; charset=utf-8');
 
 require_once 'loghandler.php';
 
diff --git a/apps/contacts/ajax/uploadphoto.php b/apps/contacts/ajax/uploadphoto.php
index 7ec82603b4a4a5d0d828b0028e1986a9702c2ff6..34830b291d2f302831dd90e4fbe4c6ee495f296d 100644
--- a/apps/contacts/ajax/uploadphoto.php
+++ b/apps/contacts/ajax/uploadphoto.php
@@ -26,7 +26,7 @@ OCP\JSON::checkAppEnabled('contacts');
 OCP\JSON::callCheck();
 
 // Firefox and Konqueror tries to download application/json for me.  --Arthur
-OCP\JSON::setContentTypeHeader('text/plain');
+OCP\JSON::setContentTypeHeader('text/plain; charset=utf-8');
 require_once 'loghandler.php';
 $l10n = OC_Contacts_App::$l10n;
 // If it is a Drag'n'Drop transfer it's handled here.