diff --git a/apps/qrcode/custom.html b/apps/qrcode/custom.html
index 589c0958d..f32dd5eb0 100644
--- a/apps/qrcode/custom.html
+++ b/apps/qrcode/custom.html
@@ -36,7 +36,7 @@
         var hex_only = /^[0-9a-f]+$/i;
         var output = "";
         for (var i=0; i<string.length; i++) {
-            if($.inArray(string[i], to_escape) != -1) {
+            if(string[i].includes(to_escape)) {
                 output += '\\'+string[i];
             }
             else {