diff --git a/chrome/content/zotero/xpcom/cite.js b/chrome/content/zotero/xpcom/cite.js
index 8b5050629..fdbd319d0 100644
--- a/chrome/content/zotero/xpcom/cite.js
+++ b/chrome/content/zotero/xpcom/cite.js
@@ -29,6 +29,7 @@ Zotero.Cite.System._zoteroFieldMap = {
 	"volume":["volume"],
 	"issue":["issue"],
 	"number-of-volumes":["numberOfVolumes"],
+	"number-of-pages":["numPages"],
 	"edition":["edition"],
 	"version":["version"],
 	"section":["section"],