diff --git a/init.el b/init.el
index 6734b9b..7b6d6fe 100644
--- a/init.el
+++ b/init.el
@@ -956,21 +956,21 @@ argument."
                     (setq-local completion-at-point-functions temp-capfs)))
               '((name . "my/-fricas-fix-capfs")))
   :config
-  (face-spec-set 'fricas-type-time '((t (:foreground nil
-                                         :background nil
+  (face-spec-set 'fricas-type-time '((t (:foreground unspecified
+                                         :background unspecified
                                          :inherit font-lock-type-face))))
-  (face-spec-set 'fricas-message '((t (:foreground nil
-                                       :background nil
+  (face-spec-set 'fricas-message '((t (:foreground unspecified
+                                       :background unspecified
                                        :inherit error))))
-  (face-spec-set 'fricas-undefined '((t (:foreground nil
-                                         :background nil
+  (face-spec-set 'fricas-undefined '((t (:foreground unspecified
+                                         :background unspecified
                                          :inherit nerd-icons-lblue))))
-  (face-spec-set 'fricas-algebra '((t (:foreground nil
-                                       :background nil
+  (face-spec-set 'fricas-algebra '((t (:foreground unspecified
+                                       :background unspecified
                                        :weight bold
                                        :inherit fricas-prompt))))
-  (face-spec-set 'fricas-TeX '((t (:foreground nil
-                                   :background nil
+  (face-spec-set 'fricas-TeX '((t (:foreground unspecified
+                                   :background unspecified
                                    :inherit fricas-prompt)))))
 
 ;; gnuplot (mostly for org-plot)