diff --git a/chrome/content/zotero/elements/itemBox.js b/chrome/content/zotero/elements/itemBox.js
index 01be9351f3..dd7bc8dd6b 100644
--- a/chrome/content/zotero/elements/itemBox.js
+++ b/chrome/content/zotero/elements/itemBox.js
@@ -1816,7 +1816,6 @@
 			Zotero.debug(`Hiding editor for ${textbox.getAttribute('fieldname')}`);
 			
 			var label = textbox.closest('tr').querySelector('th');
-			this._lastTabIndex = -1;
 			
 			// Prevent autocomplete breakage in Firefox 3
 			if (textbox.mController) {