diff --git a/pkgs/by-name/mi/mimalloc/package.nix b/pkgs/by-name/mi/mimalloc/package.nix
index 0cf24a7a4723..0414492d9967 100644
--- a/pkgs/by-name/mi/mimalloc/package.nix
+++ b/pkgs/by-name/mi/mimalloc/package.nix
@@ -82,6 +82,8 @@ stdenv.mkDerivation (finalAttrs: {
     "dev"
   ];
 
+  __structuredAttrs = true;
+
   meta = {
     description = "Compact, fast, general-purpose memory allocator";
     homepage = "https://github.com/microsoft/mimalloc";