diff --git a/pkgs/tools/security/mbox/default.nix b/pkgs/tools/security/mbox/default.nix
index 7034d69d0e7c..732cf7046610 100644
--- a/pkgs/tools/security/mbox/default.nix
+++ b/pkgs/tools/security/mbox/default.nix
@@ -32,7 +32,7 @@ stdenv.mkDerivation {
       homepage = http://pdos.csail.mit.edu/mbox/;
       maintainers = with maintainers; [ emery ];
       license = licenses.bsd3;
-      platforms = platforms.linux;
+      platforms = [ "x86_64-linux" ];
     };
 
-}
\ No newline at end of file
+}