diff --git a/lib/stringify.js b/lib/stringify.js
index fc05e23e..70d166a6 100644
--- a/lib/stringify.js
+++ b/lib/stringify.js
@@ -56,7 +56,7 @@ var isNonNullishPrimitive = function isNonNullishPrimitive(v) {
         || typeof v === 'bigint';
 };
 
-var scSym = Symbol('SideChannel');
+var scSym = Object.create(null);
 
 var stringify = function stringify(
     object,
@@ -84,7 +84,7 @@ var stringify = function stringify(
         // Where object last appeared in the ref tree
         var pos = tmpSc.get(object);
         step += 1;
-        if (pos != undefined) {
+        if (pos !== undefined) {
             if (pos === step) {
                 throw new RangeError('Cyclic object value');
             } else {