diff --git a/graal-nodejs/lib/internal/process/pre_execution.js b/graal-nodejs/lib/internal/process/pre_execution.js
index 9347c8b1e4a..1e9f3d70bae 100644
--- a/graal-nodejs/lib/internal/process/pre_execution.js
+++ b/graal-nodejs/lib/internal/process/pre_execution.js
@@ -120,9 +120,26 @@ function prepareExecution(options) {
 function setupSymbolDisposePolyfill() {
   // TODO(MoLow): Remove this polyfill once Symbol.dispose and Symbol.asyncDispose are available in V8.
   // eslint-disable-next-line node-core/prefer-primordials
-  Symbol.dispose ??= SymbolDispose;
+  if (typeof Symbol.dispose !== 'symbol') {
+    ObjectDefineProperty(Symbol, 'dispose', {
+      __proto__: null,
+      configurable: false,
+      enumerable: false,
+      value: SymbolDispose,
+      writable: false,
+    });
+  }
+
   // eslint-disable-next-line node-core/prefer-primordials
-  Symbol.asyncDispose ??= SymbolAsyncDispose;
+  if (typeof Symbol.asyncDispose !== 'symbol') {
+    ObjectDefineProperty(Symbol, 'asyncDispose', {
+      __proto__: null,
+      configurable: false,
+      enumerable: false,
+      value: SymbolAsyncDispose,
+      writable: false,
+    });
+  }
 }
 
 function setupUserModules(isLoaderWorker = false) {