diff --git a/packages/evasive-transform/src/generate.js b/packages/evasive-transform/src/generate.js
index 468ca255d9..104a3a4b98 100644
--- a/packages/evasive-transform/src/generate.js
+++ b/packages/evasive-transform/src/generate.js
@@ -66,12 +66,18 @@ export const generate =
       // 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),
-        retainLines: true,
-        compact: true,
-      });
+      const source = options ? options.source : undefined;
+      const result = generator(
+        ast,
+        {
+          sourceFileName: sourceUrl,
+          sourceMaps: Boolean(sourceUrl),
+          retainLines: true,
+          preserveFormat: true,
+          compact: true,
+        },
+        source,
+      );
 
       if (sourceUrl) {
         return {
diff --git a/packages/evasive-transform/src/index.js b/packages/evasive-transform/src/index.js
index cb3cc0025e..0dc60bba94 100644
--- a/packages/evasive-transform/src/index.js
+++ b/packages/evasive-transform/src/index.js
@@ -72,7 +72,7 @@ export function evadeCensorSync(source, options) {
   if (sourceUrl) {
     return generate(ast, { sourceUrl });
   }
-  return generate(ast);
+  return generate(ast, { source });
 }
 
 /**
diff --git a/packages/evasive-transform/src/parse-ast.js b/packages/evasive-transform/src/parse-ast.js
index 9bb74dbe2d..e93fa37f90 100644
--- a/packages/evasive-transform/src/parse-ast.js
+++ b/packages/evasive-transform/src/parse-ast.js
@@ -33,7 +33,11 @@ const { parse: parseBabel } = babelParser;
  * @param {ParseAstOptions} [opts] - Options for underlying parser
  * @internal
  */
-export function parseAst(source, opts) {
+export function parseAst(source, opts = {}) {
   // Might not want to pass `opts` verbatim, but also might not matter!
-  return parseBabel(source, opts);
+  return parseBabel(source, {
+    tokens: true,
+    createParenthesizedExpression: true,
+    ...opts,
+  });
 }