diff --git a/lisp/doom-ui.el b/lisp/doom-ui.el
index 534c7e8cb..05cc20c12 100644
--- a/lisp/doom-ui.el
+++ b/lisp/doom-ui.el
@@ -632,11 +632,13 @@ triggering hooks during startup."
   (put sym 'disabled "Doom doesn't support `customize', configure Emacs from $DOOMDIR/config.el instead"))
 (put 'customize-themes 'disabled "Set `doom-theme' or use `load-theme' in $DOOMDIR/config.el instead")
 
-;; Doesn't exist in terminal Emacs, but some Emacs packages (internal and
-;; external) use it anyway, leading to a void-function error, so define a no-op
-;; substitute to suppress them.
+;; These two functions don't exist in terminal Emacs, but some Emacs packages
+;; (internal and external) use it anyway, leading to void-function errors. I
+;; define a no-op substitute to suppress them.
 (unless (fboundp 'define-fringe-bitmap)
   (fset 'define-fringe-bitmap #'ignore))
+(unless (fboundp 'set-fontset-font)
+  (fset 'set-fontset-font #'ignore))
 
 (after! whitespace
   (defun doom-is-childframes-p ()