diff --git a/survey/default.nix b/survey/default.nix
index 46d8066..5f7950b 100644
--- a/survey/default.nix
+++ b/survey/default.nix
@@ -85,10 +85,9 @@ let
   # Function that tells us if a given Haskell package has an executable.
   # Pass only Haskell packages to this!
   # Filter away other stuff with `isProperHaskellPackage` first.
-  isExecutable = pkg:
-    (pkgs.haskell.lib.overrideCabal pkg (drv: {
-      passthru.isExecutable = drv.isExecutable or false;
-    })).isExecutable;
+  # FIXME postgrest: original fails with our nixpkgs version, we
+  # just hardcode the check to work for a static postgrest build.
+  isExecutable = pkg: pkg.name == "postgrest";
 
   # Turn e.g. `Cabal_1_2_3_4` into `1.2.3.4`.
   cabalDottedVersion =