diff --git a/pkgs/tools/networking/mailutils/default.nix b/pkgs/tools/networking/mailutils/default.nix
index 935cadbd7b8..9cf5f91cd6d 100644
--- a/pkgs/tools/networking/mailutils/default.nix
+++ b/pkgs/tools/networking/mailutils/default.nix
@@ -115,6 +115,6 @@ stdenv.mkDerivation rec {
     homepage = "https://www.gnu.org/software/mailutils/";
 
     # Some of the dependencies fail to build on {cyg,dar}win.
-    platforms = platforms.gnu ++ platforms.linux;
+    platforms = platforms.gnu ++ platforms.unix;
   };
 }