diff --git a/pkgs/applications/misc/ssocr/default.nix b/pkgs/applications/misc/ssocr/default.nix
index 0f8895fa158f..520ea84ebd99 100644
--- a/pkgs/applications/misc/ssocr/default.nix
+++ b/pkgs/applications/misc/ssocr/default.nix
@@ -22,5 +22,6 @@ stdenv.mkDerivation rec {
     license = licenses.gpl3;
     maintainers = [ maintainers.kroell ];
     mainProgram = "ssocr";
+    platforms = platforms.unix;
   };
 }