diff --git a/html5/connect.html b/html5/connect.html
index 183db2e3..6099a9f1 100644
--- a/html5/connect.html
+++ b/html5/connect.html
@@ -1321,7 +1321,7 @@
Advanced options
}
function safe_session(name) {
- return Utilities.removeChars('a-zA-Z0-9\:-%"', name);
+ return Utilities.removeChars('a-zA-Z0-9\\:\\-%"', name);
}
const display = getparam("display") || "";
function init_shadow_display() {