diff --git a/xlsx.js b/xlsx.js
index 27683a6..b9b5a6e 100644
--- a/xlsx.js
+++ b/xlsx.js
@@ -3675,6 +3675,7 @@ function parse_wb_bin(data, opts) {
 			case 'BrtACBegin': break;
 			case 'BrtAbsPath15': break;
 			case 'BrtACEnd': break;
+			case 'BrtWbFactoid': break;
 			/*case 'BrtBookProtectionIso': break;*/
 			case 'BrtBookProtection': break;
 			case 'BrtBeginBookViews': break;