diff --git a/chrome/content/zotero/bindings/tagsbox.xml b/chrome/content/zotero/bindings/tagsbox.xml
index 4a8a84b4a..16ea34e16 100644
--- a/chrome/content/zotero/bindings/tagsbox.xml
+++ b/chrome/content/zotero/bindings/tagsbox.xml
@@ -638,6 +638,7 @@
 					var tabindex = textbox.getAttribute('ztabindex');
 					
 					var oldValue = textbox.getAttribute('value');
+					textbox.value = textbox.value.trim();
 					var value = textbox.value;
 					
 					var tagsbox = Zotero.getAncestorByTagName(textbox, 'tagsbox');