diff --git a/fiduswriter/book/static/js/modules/books/exporter/dom_export.js b/fiduswriter/book/static/js/modules/books/exporter/epub/dom_export.js
similarity index 96%
rename from fiduswriter/book/static/js/modules/books/exporter/dom_export.js
rename to fiduswriter/book/static/js/modules/books/exporter/epub/dom_export.js
index a790e2a..0098ce5 100644
--- a/fiduswriter/book/static/js/modules/books/exporter/dom_export.js
+++ b/fiduswriter/book/static/js/modules/books/exporter/epub/dom_export.js
@@ -1,18 +1,18 @@
 import {DOMSerializer} from "prosemirror-model"
-import {RenderCitations} from "../../citations/render"
-import {get} from "../../common"
-import {BIBLIOGRAPHY_HEADERS, CATS} from "../../schema/i18n"
+import {RenderCitations} from "../../../citations/render"
+import {get} from "../../../common"
+import {BIBLIOGRAPHY_HEADERS, CATS} from "../../../schema/i18n"
 
 /*
 
 WARNING: DEPRECATED!
 
 Base exporter class for dom-based exports. This is the deprecated way of creating exports.
-The epub and html book export filters go over a DOM of a document which they change little
-by little, and they are all based on the BaseDOMExporter class.
+The epub book export filter goes over a DOM of a document which they change little
+by little, and it is based on the DOMExporter class.
 
     New exporters should instead by walking the doc.content tree.
-    This is how all document exporters work, including the new HTML/EPUB exporter.
+    This is how all document exporters work, including the new EPUB exporter.
 */
 
 export class DOMExporter {
diff --git a/fiduswriter/book/static/js/modules/books/exporter/epub/index.js b/fiduswriter/book/static/js/modules/books/exporter/epub/index.js
index 4e4bd27..d4c06a0 100644
--- a/fiduswriter/book/static/js/modules/books/exporter/epub/index.js
+++ b/fiduswriter/book/static/js/modules/books/exporter/epub/index.js
@@ -6,8 +6,8 @@ import {getTimestamp} from "../../../exporter/epub/tools"
 import {mathliveOpfIncludes} from "../../../mathlive/opf_includes"
 import {BIBLIOGRAPHY_HEADERS} from "../../../schema/i18n"
 import {bookTerm} from "../../i18n"
-import {DOMExporter} from "../dom_export"
-import {getMissingChapterData, uniqueObjects} from "../tools"
+import {getMissingChapterData} from "../tools"
+import {DOMExporter} from "./dom_export"
 import {
     epubBookCopyrightTemplate,
     epubBookCoverTemplate,
@@ -22,7 +22,8 @@ import {
     modifyImages,
     orderLinks,
     setLinks,
-    styleEpubFootnotes
+    styleEpubFootnotes,
+    uniqueObjects
 } from "./tools"
 
 import {RenderCitations} from "../../../citations/render"
diff --git a/fiduswriter/book/static/js/modules/books/exporter/epub/tools.js b/fiduswriter/book/static/js/modules/books/exporter/epub/tools.js
index 968ed2f..6b6b809 100644
--- a/fiduswriter/book/static/js/modules/books/exporter/epub/tools.js
+++ b/fiduswriter/book/static/js/modules/books/exporter/epub/tools.js
@@ -165,3 +165,22 @@ export const modifyImages = htmlEl => {
 
     return images
 }
+
+export const uniqueObjects = array => {
+    const results = []
+
+    for (let i = 0; i < array.length; i++) {
+        let willCopy = true
+        for (let j = 0; j < i; j++) {
+            if (JSON.stringify(array[i]) === JSON.stringify(array[j])) {
+                willCopy = false
+                break
+            }
+        }
+        if (willCopy) {
+            results.push(array[i])
+        }
+    }
+
+    return results
+}
diff --git a/fiduswriter/book/static/js/modules/books/exporter/tools.js b/fiduswriter/book/static/js/modules/books/exporter/tools.js
index 2ff1a8f..3ba0e37 100644
--- a/fiduswriter/book/static/js/modules/books/exporter/tools.js
+++ b/fiduswriter/book/static/js/modules/books/exporter/tools.js
@@ -34,22 +34,3 @@ export const getMissingChapterData = (
     )
     return returnData
 }
-
-export const uniqueObjects = array => {
-    const results = []
-
-    for (let i = 0; i < array.length; i++) {
-        let willCopy = true
-        for (let j = 0; j < i; j++) {
-            if (JSON.stringify(array[i]) === JSON.stringify(array[j])) {
-                willCopy = false
-                break
-            }
-        }
-        if (willCopy) {
-            results.push(array[i])
-        }
-    }
-
-    return results
-}