diff --git a/packages/bundler/CHANGELOG.md b/packages/bundler/CHANGELOG.md
index b7eb5b336..fd47cd01c 100644
--- a/packages/bundler/CHANGELOG.md
+++ b/packages/bundler/CHANGELOG.md
@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Unreleased
 * Fixed issue where excluded URLs were not resolved by the analyzer when bundler was initialized, resulting in some imports not being treated as excluded.
+* Fixed issue where `<script type="module" src="x.js">` tags would not inline if the referenced script contained no `import` or `export` statements.
 * Removed non-essential files from published package, such as tests.
 <!-- Add new, unreleased changes here. -->
 
diff --git a/packages/bundler/src/deps-index.ts b/packages/bundler/src/deps-index.ts
index 5c04c7d03..a98ff0504 100644
--- a/packages/bundler/src/deps-index.ts
+++ b/packages/bundler/src/deps-index.ts
@@ -12,7 +12,7 @@
  * http://polymer.github.io/PATENTS.txt
  */
 import {Analyzer, Document, Import, ResolvedUrl} from 'polymer-analyzer';
-import {JavaScriptDocument} from 'polymer-analyzer/lib/javascript/javascript-document';
+import {ScriptTagImport} from 'polymer-analyzer/lib/html/html-script-tag';
 
 import {getAnalysisDocument} from './analyzer-utils';
 
@@ -165,8 +165,7 @@ function getDependencies(
         [...document.getFeatures({kind: 'html-script', ...getFeaturesOptions})]
             .filter(
                 (i) => i.document !== undefined &&
-                    (i.document.parsedDocument as JavaScriptDocument)
-                            .parsedAsSourceType === 'module');
+                    i instanceof ScriptTagImport && i.isModule);
     for (const htmlScript of htmlScripts) {
       const relativeUrl =
           analyzer.urlResolver.relative(document.url, htmlScript.document!.url);
diff --git a/packages/bundler/src/html-bundler.ts b/packages/bundler/src/html-bundler.ts
index da88eada0..4b1612440 100644
--- a/packages/bundler/src/html-bundler.ts
+++ b/packages/bundler/src/html-bundler.ts
@@ -511,7 +511,7 @@ export class HtmlBundler {
       if (!this.assignedBundle.bundle.files.has(resolvedImportUrl)) {
         return;
       }
-      const scriptContent = `import ${JSON.stringify(scriptHref)};`;
+      const scriptContent = `import ${JSON.stringify(resolvedImportUrl)};`;
       dom5.removeAttribute(scriptTag, 'src');
       dom5.setTextContent(scriptTag, encodeString(scriptContent, true));
     }
diff --git a/packages/bundler/src/test/html-bundler_test.ts b/packages/bundler/src/test/html-bundler_test.ts
index 9762731ea..d053b2f32 100644
--- a/packages/bundler/src/test/html-bundler_test.ts
+++ b/packages/bundler/src/test/html-bundler_test.ts
@@ -30,6 +30,28 @@ const stripSpace = (html: string): string =>
     html.replace(/>\s+/g, '>').replace(/>/g, '>\n').trim();
 
 suite('HtmlBundler', () => {
+  test('external script tag inlines without imports/exports', async () => {
+    // This is a regression test added to ensure coverage for
+    // https://github.com/Polymer/tools/issues/3323
+    const analyzer = inMemoryAnalyzer({
+      'entrypoint.html': heredoc`
+        <script src="module.js" type="module"></script>
+      `,
+      'module.js': heredoc`
+        console.log('import/export-free code');
+      `
+    });
+    const bundler = new Bundler({analyzer});
+    const entrypointUrl = analyzer.resolveUrl('entrypoint.html')!;
+    const {documents} =
+        await bundler.bundle(await bundler.generateManifest([entrypointUrl]));
+    const entrypointDoc = documents.getHtmlDoc(entrypointUrl)!;
+    assert.deepEqual(entrypointDoc.content, heredoc`
+        <script type="module">
+        console.log('import/export-free code');
+        </script>
+      `);
+  });
   test('external script tag inlines an es6 module', async () => {
     const root = 'test/html/inline-es6-modules';
     const analyzer = new Analyzer({