diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index e3a501a52263a444dbb0ba06cd4c362a94bb8b3d..1179f1eacb82948941e72b119842bd07480777b4 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -28,6 +28,7 @@ For a detailed view of what's changed, refer to the {url-repo}/commits[commit hi
 * use GeneratorContext#require to require `@antora/assembler` from PDF extension
 * skip duplicate internal nav entry if first child of matching nav entry (#36)
 * unlink duplicate internal nav entry elsewhere in nav (#36)
+* use `keepSource` option on site AsciiDoc config to get document converter to preserve AsciiDoc source (#38)
 
 == 1.0.0-alpha.7 (2023-11-13)
 
diff --git a/packages/pdf-extension/lib/index.js b/packages/pdf-extension/lib/index.js
index 520c6535c6eea153348e8864370d4607cb8fd6d4..f39c4194eeb14a8596b45bacd2a3a4e6cf6b5c39 100644
--- a/packages/pdf-extension/lib/index.js
+++ b/packages/pdf-extension/lib/index.js
@@ -3,12 +3,8 @@
 const convertDocumentToPdf = require('./convert-document-to-pdf')
 
 module.exports.register = function () {
-  this.once('contentClassified', ({ contentCatalog }) => {
-    contentCatalog.getPages((page) => {
-      if (!page.out) return
-      page.src.contents = page.contents
-      page.src = new Proxy(page.src, { deleteProperty: (o, p) => (p === 'contents' ? true : delete o[p]) })
-    })
+  this.once('beforeProcess', ({ siteAsciiDocConfig }) => {
+    siteAsciiDocConfig.keepSource = true
   })
   this.once('beforePublish', ({ playbook, contentCatalog, siteCatalog }) => {
     const { assembleContent } = this.require('@antora/assembler')
diff --git a/packages/pdf-extension/test/pdf-extension-test.js b/packages/pdf-extension/test/pdf-extension-test.js
index 22c29c2bbe5e55c7aef6f7970028ee3594534eed..903ca3b957fe712ac2eb3bdb052094802569eec2 100644
--- a/packages/pdf-extension/test/pdf-extension-test.js
+++ b/packages/pdf-extension/test/pdf-extension-test.js
@@ -27,5 +27,12 @@ describe('pdf-extension', () => {
       ext.register.call(generatorContext)
       expect(generatorContext.beforePublish).to.be.instanceOf(Function)
     })
+
+    it('should set keepSource on AsciiDoc config during beforeProcess event', () => {
+      ext.register.call(generatorContext)
+      const siteAsciiDocConfig = {}
+      generatorContext.beforeProcess({ siteAsciiDocConfig })
+      expect(siteAsciiDocConfig.keepSource).to.be.true()
+    })
   })
 })