diff --git a/pkgs/by-name/va/vassal/package.nix b/pkgs/by-name/va/vassal/package.nix
index 22e11c5d54a1..71ad88b050c2 100644
--- a/pkgs/by-name/va/vassal/package.nix
+++ b/pkgs/by-name/va/vassal/package.nix
@@ -79,7 +79,7 @@ stdenv.mkDerivation rec {
     sourceProvenance = with sourceTypes; [ binaryBytecode ];
     license = licenses.lgpl21Only;
     maintainers = with maintainers; [ tvestelind ];
-    platforms = platforms.unix;
+    platforms = with lib.platforms; unix ++ windows;
     mainProgram = "vassal";
   };
 }