diff --git a/extras/webhid.html b/extras/webhid.html
index e2c336a..e4c8f24 100644
--- a/extras/webhid.html
+++ b/extras/webhid.html
@@ -194,7 +194,7 @@ <h4>Feature report</h4>
 
 		function addReportId() {
 			var reportid = document.querySelector("#addreportid input").value;
-			reportid = parseInt(reportId);
+			reportid = parseInt(reportid);
 			if (isNaN(reportid) || reportid < 0 || reportid > 255) {
 				alert("Invalid report ID");
 				return;