diff --git a/pkgs/by-name/tz/tzdata/package.nix b/pkgs/by-name/tz/tzdata/package.nix
index 75cb3cc49134..7e3f8f38535d 100644
--- a/pkgs/by-name/tz/tzdata/package.nix
+++ b/pkgs/by-name/tz/tzdata/package.nix
@@ -35,6 +35,8 @@ stdenv.mkDerivation (finalAttrs: {
   ];
   propagatedBuildOutputs = [ ];
 
+  strictDeps = true;
+
   makeFlags = [
     "TOPDIR=${placeholder "out"}"
     "TZDIR=${placeholder "out"}/share/zoneinfo"
@@ -113,6 +115,8 @@ stdenv.mkDerivation (finalAttrs: {
   # minor releases.
   passthru.tests = postgresql;
 
+  __structuredAttrs = true;
+
   meta = {
     homepage = "http://www.iana.org/time-zones";
     description = "Database of current and historical time zones";