diff --git a/lisp/minibuffer.el b/lisp/minibuffer.el
index 556f5d3a56..a6afb04efb 100644
--- a/lisp/minibuffer.el
+++ b/lisp/minibuffer.el
@@ -1790,7 +1790,7 @@ completion--insert-strings
                     ;; by the caller via affixation-function,
                     ;; then allow the caller to decide
                     ;; what faces to put on prefix and suffix.
-                    (unless prefix
+                    (unless suffix
                       (font-lock-prepend-text-property
                        beg end 'face 'completions-annotations))))
                 (put-text-property (point) (progn (insert (car str)) (point))