diff --git a/overlays/30-ghc.nix b/overlays/30-ghc.nix
index 6765db70..bfc9ff75 100644
--- a/overlays/30-ghc.nix
+++ b/overlays/30-ghc.nix
@@ -28,6 +28,7 @@ let
 in
 {
   inherit ghc haskellPackages;
+  cachix = master.cachix;
   nix-output-monitor = master.nix-output-monitor;
   myHaskellPackages = makeHaskellPackages haskellPackages;
   myHaskellScriptPackages = makeHaskellScriptPackages haskellPackages;