diff --git a/lib/internal/per_context/primordials.js b/lib/internal/per_context/primordials.js
index 9851f3f64f6e56..2803ae3d1c3009 100644
--- a/lib/internal/per_context/primordials.js
+++ b/lib/internal/per_context/primordials.js
@@ -420,6 +420,12 @@ primordials.SafeSet = makeSafe(
   Set,
   class SafeSet extends Set {
     constructor(i) { super(i); } // eslint-disable-line no-useless-constructor
+
+    toUnsafeSet() {
+      const set = new Set();
+      this.forEach((value) => primordials.SetPrototypeAdd(set, value));
+      return set;
+    }
   },
 );
 primordials.SafeWeakSet = makeSafe(