diff --git a/modules/wiki.nix b/modules/wiki.nix
index 2c2a393..c7dc79f 100644
--- a/modules/wiki.nix
+++ b/modules/wiki.nix
@@ -87,6 +87,10 @@ in
           url = "https://extdist.wmflabs.org/dist/extensions/VisualEditor-REL1_40-c6aec49.tar.gz";
           hash = "sha256-p66C7ks0ocy5sL7LTkFQuDA3/2uSXdfldUXoOQ6afWM=";
         };
+        SyntaxHighlight = pkgs.fetchzip {
+          url = "https://extdist.wmflabs.org/dist/extensions/SyntaxHighlight_GeSHi-REL1_40-ded412b.tar.gz";
+          hash = "sha256-mlNrcZhGADqzdLNeck0ATv44W3cTTOykQouHJTaj5cA=";
+	};
       };
     };