diff --git a/defaults/preferences/zotero.js b/defaults/preferences/zotero.js
index ee494d9c9..4054fb6f8 100644
--- a/defaults/preferences/zotero.js
+++ b/defaults/preferences/zotero.js
@@ -175,5 +175,5 @@ pref("extensions.zotero.fallbackLauncher.windows", "");
 //Translators
 pref("extensions.zotero.translators.attachSupplementary", false);
 pref("extensions.zotero.translators.supplementaryAsLink", false);
-pref("extensions.zotero.translators.RIS.import.ignoreUnknown", false);
+pref("extensions.zotero.translators.RIS.import.ignoreUnknown", true);
 pref("extensions.zotero.translators.RIS.import.keepID", false);