diff --git a/lisp/minibuffer.el b/lisp/minibuffer.el
index d2c3f9045e..a598b1d1fd 100644
--- a/lisp/minibuffer.el
+++ b/lisp/minibuffer.el
@@ -3585,10 +3585,12 @@ that is non-nil."
          (pattern (if (not (stringp (car basic-pattern)))
                       basic-pattern
                     (cons 'prefix basic-pattern)))
-         (pattern (completion-pcm--optimize-pattern
-                   (if transform-pattern-fn
-                       (funcall transform-pattern-fn pattern)
-                     pattern)))
+         (pattern (append
+                   (completion-pcm--optimize-pattern
+                    (if transform-pattern-fn
+                        (funcall transform-pattern-fn pattern)
+                      pattern))
+                   '(any)))             ; make implicit `any' explicit
          (all (completion-pcm--all-completions prefix pattern table pred)))
     (list all pattern prefix suffix (car bounds))))