diff --git a/bookwyrm/static/js/check_all.js b/bookwyrm/static/js/check_all.js
index 07d30a686..72c83e3e9 100644
--- a/bookwyrm/static/js/check_all.js
+++ b/bookwyrm/static/js/check_all.js
@@ -1,17 +1,24 @@
-/* exported toggleAllCheckboxes */
-
 /**
  * Toggle all descendant checkboxes of a target.
  *
- * Use `data-target="ID_OF_TARGET"` on the node being listened to.
- *
- * @param  {Event} event - change Event
- * @return {undefined}
+ * Use `data-target="ID_OF_TARGET"` on the node on which the event is listened
+ * to (checkbox, button, link…), where_ID_OF_TARGET_ should be the ID of an
+ * ancestor for the checkboxes.
  */
-function toggleAllCheckboxes(event) {
-    const mainCheckbox = event.target;
+(function() {
+    'use strict';
+
+    function toggleAllCheckboxes(event) {
+        const mainCheckbox = event.target;
+
+        document
+            .querySelectorAll(`#${mainCheckbox.dataset.target} [type="checkbox"]`)
+            .forEach(checkbox => {checkbox.checked = mainCheckbox.checked;});
+    }
 
     document
-        .querySelectorAll(`#${mainCheckbox.dataset.target} [type="checkbox"]`)
-        .forEach(checkbox => {checkbox.checked = mainCheckbox.checked;});
-}
+        .querySelectorAll('[data-action="toggle-all"]')
+        .forEach(input => {
+            input.addEventListener('change', toggleAllCheckboxes);
+        });
+})();
diff --git a/bookwyrm/static/js/shared.js b/bookwyrm/static/js/shared.js
index 7a198619c..5ca3d7d7a 100644
--- a/bookwyrm/static/js/shared.js
+++ b/bookwyrm/static/js/shared.js
@@ -1,4 +1,4 @@
-/* globals setDisplay TabGroup toggleAllCheckboxes updateDisplay */
+/* globals setDisplay TabGroup updateDisplay */
 
 // set up javascript listeners
 window.onload = function() {
@@ -36,13 +36,6 @@ window.onload = function() {
     // update localstorage
     Array.from(document.getElementsByClassName('set-display'))
         .forEach(t => t.onclick = updateDisplay);
-
-    // Toggle all checkboxes.
-    document
-        .querySelectorAll('[data-action="toggle-all"]')
-        .forEach(input => {
-            input.addEventListener('change', toggleAllCheckboxes);
-        });
 };
 
 function back(e) {