diff --git a/pkgs/servers/sql/postgresql/wrapper.nix b/pkgs/servers/sql/postgresql/wrapper.nix
index 2f81cc546588..c2a44ca46ce0 100644
--- a/pkgs/servers/sql/postgresql/wrapper.nix
+++ b/pkgs/servers/sql/postgresql/wrapper.nix
@@ -40,15 +40,16 @@ buildEnv (finalAttrs: {
   derivationArgs = {
     strictDeps = true;
     nativeBuildInputs = [ makeBinaryWrapper ];
-    postBuild =
-      let
-        args = lib.concatMap (ext: ext.wrapperArgs or [ ]) installedExtensions;
-      in
-      ''
-        wrapProgram "$out/bin/postgres" ${lib.concatStringsSep " " args}
-      '';
   };
 
+  postBuild =
+    let
+      args = lib.concatMap (ext: ext.wrapperArgs or [ ]) installedExtensions;
+    in
+    ''
+      wrapProgram "$out/bin/postgres" ${lib.concatStringsSep " " args}
+    '';
+
   passthru = {
     inherit installedExtensions;
     inherit (postgresql)