diff --git a/bits/71_wbcommon.js b/bits/71_wbcommon.js
index 02e4107..ee07ea8 100644
--- a/bits/71_wbcommon.js
+++ b/bits/71_wbcommon.js
@@ -113,7 +113,7 @@ function safe1904(wb/*:Workbook*/)/*:string*/ {
 	return parsexmlbool(wb.Workbook.WBProps.date1904) ? "true" : "false";
 }
 
-var badchars = /*#__PURE__*/"][*?\/\\".split("");
+var badchars = /*#__PURE__*/":][*?\/\\".split("");
 function check_ws_name(n/*:string*/, safe/*:?boolean*/)/*:boolean*/ {
 	try {
 		if(n == "") throw new Error("Sheet name cannot be blank");