diff --git a/chrome/content/zotero/xpcom/reader.js b/chrome/content/zotero/xpcom/reader.js
index 57adb035a8..07ffcb8e3b 100644
--- a/chrome/content/zotero/xpcom/reader.js
+++ b/chrome/content/zotero/xpcom/reader.js
@@ -1048,10 +1048,7 @@ class Reader {
 				}
 			};
 		}
-
-		if (reader instanceof ReaderWindow) {
-			reader._window.focus();
-		}
+		reader._window.focus();
 	}
 
 	/**