diff --git a/pkgs/top-level/metrics.nix b/pkgs/top-level/metrics.nix
index 26ef31c4a1d8..fe9437572e93 100644
--- a/pkgs/top-level/metrics.nix
+++ b/pkgs/top-level/metrics.nix
@@ -201,4 +201,11 @@ stdenvNoCC.mkDerivation {
     exit_status = "%x";
     command = "%C";
   };
+
+  # Don't allow aliases anywhere in Nixpkgs for the metrics.
+  env.NIXPKGS_CONFIG = builtins.toFile "nixpkgs-config.nix" ''
+    {
+      allowAliases = false;
+    }
+  '';
 }