diff --git a/nixos/modules/config/fonts/fontconfig.nix b/nixos/modules/config/fonts/fontconfig.nix
index 98d90ccc0fca..feb7546b8de8 100644
--- a/nixos/modules/config/fonts/fontconfig.nix
+++ b/nixos/modules/config/fonts/fontconfig.nix
@@ -183,7 +183,7 @@ let
     # horrible sed hack to add the line that was accidentally removed
     # from the default config in #324516
     # FIXME: fix that, revert this
-    sed "5i <include ignore_missing="yes">/etc/fonts/conf.d</include>" -i $dst/../fonts.conf
+    sed '5i <include ignore_missing="yes">/etc/fonts/conf.d</include>' -i $dst/../fonts.conf
 
     # TODO: remove this legacy symlink once people stop using packages built before #95358 was merged
     mkdir -p $out/etc/fonts/2.11