diff --git a/jupyter/flake.nix b/jupyter/flake.nix
index 915ce23..f22b198 100644
--- a/jupyter/flake.nix
+++ b/jupyter/flake.nix
@@ -32,14 +32,16 @@
             name = "jupyter-ihaskell";
             format = "other";
 
-            unpackPhase = ": 3";
+            unpackPhase = ": 3"; # we don't have any sources
 
             nativeBuildInputs = [ (python.withPackages (ps: with ps; [ jupyter jupyter-core ])) ];
 
-            # for some reason, ihaskell wants to create $HOME/.ihaskell 3:
-            buildPhase = ''
+            # for some reason, ihaskell wants to create $HOME/.ihaskell
+            # we set $HOME to $out, and then remove the .ihaskell file
+            installPhase = ''
               mkdir -p $out
               HOME=$out ${pkgs.ihaskell}/bin/ihaskell install --prefix=$out
+              rm -rf $out/.ihaskell
             '';
           };