diff --git a/ext/bg/background.html b/ext/bg/background.html
index 4410c249..4a2d8c8d 100644
--- a/ext/bg/background.html
+++ b/ext/bg/background.html
@@ -8,7 +8,7 @@
         <script src="/mixed/lib/dexie.min.js"></script>
         <script src="/mixed/lib/wanakana.min.js"></script>
         <script src="/mixed/lib/jszip.min.js"></script>
-        <script src="/mixed/js/util.js"></script>
+        <script src="/mixed/js/audio.js"></script>
         <script src="/bg/js/templates.js"></script>
         <script src="/bg/js/util.js"></script>
         <script src="/bg/js/anki-connect.js"></script>
diff --git a/ext/bg/search.html b/ext/bg/search.html
index 4c07ee61..0fc3caf7 100644
--- a/ext/bg/search.html
+++ b/ext/bg/search.html
@@ -34,7 +34,7 @@
 
         <script src="/mixed/lib/jquery.min.js"></script>
         <script src="/bg/js/util.js"></script>
-        <script src="/mixed/js/util.js"></script>
+        <script src="/mixed/js/audio.js"></script>
         <script src="/mixed/js/display.js"></script>
         <script src="/mixed/lib/wanakana.min.js"></script>
         <script src="/bg/js/display-window.js"></script>
diff --git a/ext/fg/frame.html b/ext/fg/frame.html
index c20745af..ecaee323 100644
--- a/ext/fg/frame.html
+++ b/ext/fg/frame.html
@@ -33,7 +33,7 @@
         <script src="/mixed/lib/jquery.min.js"></script>
         <script src="/mixed/lib/wanakana.min.js"></script>
         <script src="/fg/js/util.js"></script>
-        <script src="/mixed/js/util.js"></script>
+        <script src="/mixed/js/audio.js"></script>
         <script src="/mixed/js/display.js"></script>
         <script src="/fg/js/display-frame.js"></script>
     </body>
diff --git a/ext/mixed/js/util.js b/ext/mixed/js/audio.js
similarity index 92%
rename from ext/mixed/js/util.js
rename to ext/mixed/js/audio.js
index 0a8c914d..451fe1d9 100644
--- a/ext/mixed/js/util.js
+++ b/ext/mixed/js/audio.js
@@ -17,25 +17,6 @@
  */
 
 
-/*
- * Cloze
- */
-
-function clozeBuild(sentence, source) {
-    const result = {
-        sentence: sentence.text.trim()
-    };
-
-    if (source) {
-        result.prefix = sentence.text.substring(0, sentence.offset).trim();
-        result.body = source.trim();
-        result.suffix = sentence.text.substring(sentence.offset + source.length).trim();
-    }
-
-    return result;
-}
-
-
 /*
  * Audio
  */
diff --git a/ext/mixed/js/display.js b/ext/mixed/js/display.js
index da0cd351..e54bc0f9 100644
--- a/ext/mixed/js/display.js
+++ b/ext/mixed/js/display.js
@@ -80,7 +80,7 @@ class Display {
         if (context) {
             for (const definition of definitions) {
                 if (context.sentence) {
-                    definition.cloze = clozeBuild(context.sentence, definition.source);
+                    definition.cloze = Display.clozeBuild(context.sentence, definition.source);
                 }
 
                 definition.url = context.url;
@@ -119,7 +119,7 @@ class Display {
         if (context) {
             for (const definition of definitions) {
                 if (context.sentence) {
-                    definition.cloze = clozeBuild(context.sentence);
+                    definition.cloze = Display.clozeBuild(context.sentence);
                 }
 
                 definition.url = context.url;
@@ -394,6 +394,20 @@ class Display {
         }).catch(this.handleError.bind(this)).then(() => this.spinner.hide());
     }
 
+    static clozeBuild(sentence, source) {
+        const result = {
+            sentence: sentence.text.trim()
+        };
+
+        if (source) {
+            result.prefix = sentence.text.substring(0, sentence.offset).trim();
+            result.body = source.trim();
+            result.suffix = sentence.text.substring(sentence.offset + source.length).trim();
+        }
+
+        return result;
+    }
+
     static entryIndexFind(element) {
         return $('.entry').index(element.closest('.entry'));
     }