diff --git a/chrome/content/zotero/xpcom/csl.js b/chrome/content/zotero/xpcom/csl.js
index 76bedc9fba..3fa334f523 100644
--- a/chrome/content/zotero/xpcom/csl.js
+++ b/chrome/content/zotero/xpcom/csl.js
@@ -413,7 +413,7 @@ Zotero.CSL.prototype.formatBibliography = function(itemSet, format) {
 			//
 			// Ignore URLs preceded by '>', since these are likely already links
 			string = string.replace(/([^>])(https?:\/\/[^\s]+)([\."'>:\]\)\s])/g, '$1<a href="$2">$2</a>$3');
-			string = string.replace(/(doi:[ ]*)([0-9][^\s]+[0-9])/g, '$1<a href="http://dx.doi.org/$2">$2</a>');
+			string = string.replace(/(doi:[ ]*)(10\.[^\s]+[0-9a-zA-Z])/g, '$1<a href="http://dx.doi.org/$2">$2</a>');
 			
 			var span = (coins ? ' <span class="Z3988" title="'+coins.replace("&", "&amp;", "g")+'">&nbsp;</span>' : '');