diff --git a/bin/test b/bin/test
index 73de3ed..50a8f27 100755
--- a/bin/test
+++ b/bin/test
@@ -2,4 +2,4 @@
 set -xe
 
 # NOTE: ghcid should be run with -W to allow warnings from should-not-typecheck
-nix-shell --pure --run "ghcid $* -W -c 'cabal new-repl test:jrec-test' -T \":main $*\""
+nix develop -c sh -c "ghcid $* -W -c 'cabal new-repl test:jrec-test' -T \":main $*\""
diff --git a/flake.nix b/flake.nix
index edf4e3d..62908da 100644
--- a/flake.nix
+++ b/flake.nix
@@ -23,6 +23,7 @@
             packages = p: [ p.jrec ];
             buildInputs = with ghcVersions.ghc92; [
               cabal-install
+              ghcid
               haskell-language-server
             ];
           };