diff --git a/lisp/progmodes/eglot.el b/lisp/progmodes/eglot.el
index 8d3977091d..b240e0e860 100644
--- a/lisp/progmodes/eglot.el
+++ b/lisp/progmodes/eglot.el
@@ -1345,7 +1345,10 @@ THINGS are either registrations or unregisterations."
 
 (defun eglot--TextDocumentIdentifier ()
   "Compute TextDocumentIdentifier object for current buffer."
-  `(:uri ,(eglot--path-to-uri buffer-file-name)))
+  `(:uri ,(eglot--path-to-uri (or buffer-file-name
+                                  (ignore-errors
+                                    (buffer-file-name
+                                     (buffer-base-buffer)))))))
 
 (defvar-local eglot--versioned-identifier 0)