diff --git a/chrome/content/zotero/xpcom/reader.js b/chrome/content/zotero/xpcom/reader.js
index ae35aaf062..9eb956b041 100644
--- a/chrome/content/zotero/xpcom/reader.js
+++ b/chrome/content/zotero/xpcom/reader.js
@@ -884,6 +884,10 @@ class ReaderInstance {
 					this._openThumbnailPopup(message.data);
 					return;
 				}
+				case 'openSelectorPopup': {
+					this._openSelectorPopup(message.data);
+					return;
+				}
 				case 'closePopup': {
 					// Note: This currently only closes tags popup when annotations are
 					// disappearing from pdf-reader sidebar