diff --git a/pkgs/development/libraries/cln/default.nix b/pkgs/development/libraries/cln/default.nix
index 5734e2cbe53e..66629b0561b3 100644
--- a/pkgs/development/libraries/cln/default.nix
+++ b/pkgs/development/libraries/cln/default.nix
@@ -14,6 +14,6 @@ stdenv.mkDerivation rec {
     description = "C/C++ library for numbers, a part of GiNaC";
     homepage = http://www.ginac.de/CLN/;
     maintainers = [ stdenv.lib.maintainers.urkud ];
-    platforms = stdenv.lib.platforms.all;
+    platforms = stdenv.lib.platforms.allBut "i686-cygwin";
   };
 }