diff --git a/eslint.config.mjs b/eslint.config.mjs
index f05b3d29f9c2d..efaf92d5d7df5 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -59,7 +59,6 @@ export default [{
     'src/proxyWorker.js',
     'src/proxyClient.js',
     'src/IDBStore.js',
-    'src/URIUtils.js',
     'tools/experimental',
   ],
 }, ...compat.extends('prettier'), js.configs.recommended, {
diff --git a/src/URIUtils.js b/src/URIUtils.js
index 6f098fcf9f269..2463b93758bd3 100644
--- a/src/URIUtils.js
+++ b/src/URIUtils.js
@@ -4,17 +4,3 @@
  * SPDX-License-Identifier: MIT
  */
 
-// Prefix of data URIs emitted by SINGLE_FILE and related options.
-var dataURIPrefix = 'data:application/octet-stream;base64,';
-
-/**
- * Indicates whether filename is a base64 data URI.
- * @noinline
- */
-var isDataURI = (filename) => filename.startsWith(dataURIPrefix);
-
-/**
- * Indicates whether filename is delivered via file protocol (as opposed to http/https)
- * @noinline
- */
-var isFileURI = (filename) => filename.startsWith('file://');
diff --git a/src/preamble.js b/src/preamble.js
index fb62ee4b609ae..db1f9db29a93a 100644
--- a/src/preamble.js
+++ b/src/preamble.js
@@ -140,7 +140,20 @@ var runtimeInitialized = false;
 var runtimeExited = false;
 #endif
 
-#include "URIUtils.js"
+// Prefix of data URIs emitted by SINGLE_FILE and related options.
+var dataURIPrefix = 'data:application/octet-stream;base64,';
+
+/**
+ * Indicates whether filename is a base64 data URI.
+ * @noinline
+ */
+var isDataURI = (filename) => filename.startsWith(dataURIPrefix);
+
+/**
+ * Indicates whether filename is delivered via file protocol (as opposed to http/https)
+ * @noinline
+ */
+var isFileURI = (filename) => filename.startsWith('file://');
 
 #include "runtime_shared.js"