diff --git a/chrome/content/zotero/xpcom/utilities.js b/chrome/content/zotero/xpcom/utilities.js
index 5b71866a1..c9af5ba1b 100644
--- a/chrome/content/zotero/xpcom/utilities.js
+++ b/chrome/content/zotero/xpcom/utilities.js
@@ -262,7 +262,7 @@ Zotero.Utilities = {
 			throw "cleanDOI: argument must be a string";
 		}
 		
-		return x.match(/10\.[^\s\/]+\/[^\s]*[^\s\.,]/);
+		return x.match(/10\.[0-9]{4,}\/[^\s]*[^\s\.,]/);
 	},
 
 	/**