diff --git a/lib/stringify.js b/lib/stringify.js
index 70d166a6..912672a5 100644
--- a/lib/stringify.js
+++ b/lib/stringify.js
@@ -56,7 +56,7 @@ var isNonNullishPrimitive = function isNonNullishPrimitive(v) {
         || typeof v === 'bigint';
 };
 
-var scSym = Object.create(null);
+var sentinel = {};
 
 var stringify = function stringify(
     object,
@@ -80,7 +80,7 @@ var stringify = function stringify(
     var tmpSc = sideChannel;
     var step = 0;
     var findFlag = false;
-    while ((tmpSc = tmpSc.get(scSym)) !== undefined && !findFlag) {
+    while ((tmpSc = tmpSc.get(sentinel)) !== undefined && !findFlag) {
         // Where object last appeared in the ref tree
         var pos = tmpSc.get(object);
         step += 1;
@@ -91,7 +91,7 @@ var stringify = function stringify(
                 findFlag = true; // Break while
             }
         }
-        if (tmpSc.get(scSym) === undefined) {
+        if (tmpSc.get(sentinel) === undefined) {
             step = 0;
         }
     }
@@ -164,7 +164,7 @@ var stringify = function stringify(
 
         sideChannel.set(object, step);
         var valueSideChannel = getSideChannel();
-        valueSideChannel.set(scSym, sideChannel);
+        valueSideChannel.set(sentinel, sideChannel);
         pushToArray(values, stringify(
             value,
             keyPrefix,