diff --git a/lisp/emacs-lisp/comp-cstr.el b/lisp/emacs-lisp/comp-cstr.el
index 67c72c8ce2b..39551cbac4f 100644
--- a/lisp/emacs-lisp/comp-cstr.el
+++ b/lisp/emacs-lisp/comp-cstr.el
@@ -336,9 +336,13 @@ Return them as multiple value."
       (nreverse res))))
 
 (defun comp-supertypes (type)
-  "Return the ordered list of supertypes of TYPE."
-  (or (assq type (comp-cstr-ctxt-typeof-types comp-ctxt))
-      (error "Type %S missing from typeof-types!" type)))
+   "Return the ordered list of supertypes of TYPE."
+   (or (assq type (comp-cstr-ctxt-typeof-types comp-ctxt))
+       (progn
+	 (display-warning
+	  'native-compiler
+	  (format "Unknown type %S" type))
+	 '(t))))
 
 (defun comp--union-typesets (&rest typesets)
   "Union types present into TYPESETS."
diff --git a/test/src/comp-resources/comp-test-funcs.el b/test/src/comp-resources/comp-test-funcs.el
index 3f7e7d1ab4b..837ef018efb 100644
--- a/test/src/comp-resources/comp-test-funcs.el
+++ b/test/src/comp-resources/comp-test-funcs.el
@@ -579,6 +579,9 @@
     (comp-test-73270-child3 'child3)
     (comp-test-73270-child4 'child4)))
 
+(defun comp-test-76573-1-f ()
+  (record 'undeclared-type))
+
 
 ;;;;;;;;;;;;;;;;;;;;
 ;; Tromey's tests ;;