diff --git a/chrome/locale/en-US/zotero/zotero.properties b/chrome/locale/en-US/zotero/zotero.properties
index a21ffb0dc5..904f27b044 100644
--- a/chrome/locale/en-US/zotero/zotero.properties
+++ b/chrome/locale/en-US/zotero/zotero.properties
@@ -415,7 +415,7 @@ 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.text1 = Are you sure you want to change the file extension from “%S” to “%S”?
+pane.item.attachments.rename.confirmExtChange.text1 = Are you sure you want to change the file extension from “%1$S” to “%2$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