diff --git a/pkgs/applications/science/biology/platypus/default.nix b/pkgs/applications/science/biology/platypus/default.nix
index 868540fcbc3..2947515652e 100644
--- a/pkgs/applications/science/biology/platypus/default.nix
+++ b/pkgs/applications/science/biology/platypus/default.nix
@@ -33,6 +33,6 @@ in stdenv.mkDerivation rec {
     license = licenses.gpl3;
     homepage = https://github.com/andyrimmer/Platypus;
     maintainers = with maintainers; [ jbedo ];
-    platforms = platforms.unix;
+    platforms = platforms.x86_64;
   };
 }