diff --git a/packages/evasive-transform/src/generate.js b/packages/evasive-transform/src/generate.js
index c946f7661c..a00bd2df15 100644
--- a/packages/evasive-transform/src/generate.js
+++ b/packages/evasive-transform/src/generate.js
@@ -59,7 +59,9 @@ const { default: generator } = /** @type {any} */ (babelGenerate);
 export const generate =
   /** @type {GenerateAstWithSourceMap & GenerateAstWithoutSourceMap} */ (
     (ast, options) => {
-      const sourceUrl = options?.sourceUrl;
+      // TODO Use options?.sourceUrl when resolved:
+      // https://github.com/Agoric/agoric-sdk/issues/8671
+      const sourceUrl = options ? options.sourceUrl : undefined;
       const result = generator(ast, {
         sourceFileName: sourceUrl,
         sourceMaps: Boolean(sourceUrl),
diff --git a/packages/evasive-transform/src/index.js b/packages/evasive-transform/src/index.js
index 75d02f72f5..da4b05eae0 100644
--- a/packages/evasive-transform/src/index.js
+++ b/packages/evasive-transform/src/index.js
@@ -35,7 +35,9 @@ import { generate } from './generate.js';
  * @public
  */
 export async function evadeCensor(source, options) {
-  const { sourceMap, sourceUrl, useLocationUnmap, sourceType } = options ?? {};
+  // TODO Use options ?? {} when resolved:
+  // https://github.com/Agoric/agoric-sdk/issues/8671
+  const { sourceMap, sourceUrl, useLocationUnmap, sourceType } = options || {};
 
   // See "Chesterton's Fence"
   await null;