diff --git a/hosts/mediawiki/default.nix b/hosts/mediawiki/default.nix
index c6135de5..c1496463 100644
--- a/hosts/mediawiki/default.nix
+++ b/hosts/mediawiki/default.nix
@@ -95,6 +95,9 @@ in
           echo "<?php
             return require(getenv('MEDIAWIKI_CONFIG'));
           ?>" > $out/share/mediawiki/LocalSettings.php
+
+          substituteInPlace $out/share/mediawiki/includes/config-schema.php \
+            --replace "\$path/convert" "${pkgs.imagemagick}/bin/convert"
         '';
       };
       #skins = {