diff --git a/nix/packages/backend.nix b/nix/packages/backend.nix
index e00b91b..c662526 100644
--- a/nix/packages/backend.nix
+++ b/nix/packages/backend.nix
@@ -1,13 +1,6 @@
 { php84, lib }:
 let
-  # Laravel connects to Postgres via PDO, so the runtime PHP must
-  # ship pdo_pgsql. The default php84 set ships pdo, pdo_mysql, and
-  # pdo_sqlite but not pdo_pgsql. buildEnv gives us a php with the
-  # extra extension that flows through to passthru.php and the
-  # composer build hooks.
-  php = php84.buildEnv {
-    extensions = ({ enabled, all }: enabled ++ [ all.pdo_pgsql ]);
-  };
+  php = php84;
 in
 php.buildComposerProject (finalAttrs: {
   pname = "tide-backend";