diff --git a/chrome/content/zotero/xpcom/citeproc.js b/chrome/content/zotero/xpcom/citeproc.js
index 84bc65369..b51feccf1 100644
--- a/chrome/content/zotero/xpcom/citeproc.js
+++ b/chrome/content/zotero/xpcom/citeproc.js
@@ -9214,7 +9214,7 @@ CSL.Output.Formats.prototype.html = {
 		.replace("  ", "  ", "g")
 		.replace(CSL.SUPERSCRIPTS_REGEXP,
 				 function(aChar) {
-					 return "<sup>" + CSL.SUPERSCRIPTS[aChar] + "</sup>";
+					 return "<sup>" + CSL.SUPERSCRIPTS[aChar] + "</sup>";
 				 });
 	},
 	"bibstart": "<div class=\"csl-bib-body\">\n",