diff --git a/overlay.nix b/overlay.nix
index 399e827..f860bae 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -1,6 +1,7 @@
 self: super:
 
-{
+rec {
     pegasus = super.callPackage ./pegasus/default.nix {};
-    blog = super.callPackage ./blog/default.nix {};
+    blog = self.callPackage ./blog/default.nix { katex };
+    katex = super.callPackage ./katex/default.nix {};
 }