diff --git a/pkgs/development/libraries/poco/default.nix b/pkgs/development/libraries/poco/default.nix
index ecd20d545d5..1f43be20cfb 100644
--- a/pkgs/development/libraries/poco/default.nix
+++ b/pkgs/development/libraries/poco/default.nix
@@ -28,5 +28,6 @@ stdenv.mkDerivation rec {
     description = "Cross-platform C++ libraries with a network/internet focus";
     license = licenses.boost;
     maintainers = with maintainers; [ orivej ];
+    platforms = platforms.unix;
   };
 }