diff --git a/chrome/content/zotero/elements/attachmentBox.js b/chrome/content/zotero/elements/attachmentBox.js
index edaf5b2dac..7d2af9320c 100644
--- a/chrome/content/zotero/elements/attachmentBox.js
+++ b/chrome/content/zotero/elements/attachmentBox.js
@@ -530,7 +530,9 @@
 				let index = Zotero.Prompt.confirm({
 					window,
 					title: Zotero.getString('general.warning'),
-					text: Zotero.getString('pane.item.attachments.rename.confirmExtChange.text', [oldExt, newExt, Zotero.appName]),
+					text: Zotero.getString('pane.item.attachments.rename.confirmExtChange.text1', [oldExt, newExt])
+						+ "\n\n"
+						+ Zotero.getString('pane.item.attachments.rename.confirmExtChange.text2', Zotero.appName),
 					button0: Zotero.getString('pane.item.attachments.rename.confirmExtChange.keep', oldExt),
 					button1: Zotero.getString('pane.item.attachments.rename.confirmExtChange.change', newExt),
 				});
diff --git a/chrome/locale/en-US/zotero/zotero.properties b/chrome/locale/en-US/zotero/zotero.properties
index 5fd5e0225c..4a0ad1c0bd 100644
--- a/chrome/locale/en-US/zotero/zotero.properties
+++ b/chrome/locale/en-US/zotero/zotero.properties
@@ -418,7 +418,8 @@ pane.item.notes.ignoreMissingImage = Some note images are missing and cannot be
 pane.item.attachments.rename.title	= New title:
 pane.item.attachments.rename.renameAssociatedFile		= Rename associated file
 pane.item.attachments.rename.error					= An error occurred while renaming the file.
-pane.item.attachments.rename.confirmExtChange.text = Are you sure you want to change the file extension from “%S” to “%S”?\n\nIf you change the extension, the file may open with a different application outside of %S.
+pane.item.attachments.rename.confirmExtChange.text1 = Are you sure you want to change the file extension from “%S” to “%S”?
+pane.item.attachments.rename.confirmExtChange.text2 = If you change the extension, the file may open with a different application outside of %S.
 pane.item.attachments.rename.confirmExtChange.keep = Keep %S
 pane.item.attachments.rename.confirmExtChange.change = Use %S
 pane.item.attachments.fileNotFound.title	= File Not Found