2 files changed, 4 insertions, 0 deletions
diff --git a/core/00_primordials.js b/core/00_primordials.js
index 85d924a00..63b6730db 100644
--- a/core/00_primordials.js
+++ b/core/00_primordials.js
@@ -167,6 +167,9 @@
     primordials[name] = globalThis[name];
   });
 
+  // Create copy of isNaN
+  primordials[isNaN.name] = isNaN;
+
   // Create copies of URI handling functions
   [
     decodeURI,
diff --git a/core/internal.d.ts b/core/internal.d.ts
index 5586ad49b..cd1e51eee 100644
--- a/core/internal.d.ts
+++ b/core/internal.d.ts
@@ -68,6 +68,7 @@ declare namespace __bootstrap {
       safe: T,
     ): T;
 
+    export const isNaN: typeof globalThis.isNaN;
     export const decodeURI: typeof globalThis.decodeURI;
     export const decodeURIComponent: typeof globalThis.decodeURIComponent;
     export const encodeURI: typeof globalThis.encodeURI;