diff --git a/core/modules/content_translation/content_translation.module b/core/modules/content_translation/content_translation.module
index c8bd7bb..efe8b22 100644
--- a/core/modules/content_translation/content_translation.module
+++ b/core/modules/content_translation/content_translation.module
@@ -997,7 +997,7 @@ function content_translation_save_settings($settings) {
             // If the field does not have translatable enabled we need to reset
             // the sync settings to their defaults.
             else {
-              unset($instance['settings']['translation_sync']);
+              unset($instance->settings['translation_sync']);
             }
             $instance->save();
           }