diff --git a/pkgs/development/libraries/gtk-sharp/3.0.nix b/pkgs/development/libraries/gtk-sharp/3.0.nix
index 3a473d6303ad..f8f1f20cc2fd 100644
--- a/pkgs/development/libraries/gtk-sharp/3.0.nix
+++ b/pkgs/development/libraries/gtk-sharp/3.0.nix
@@ -47,5 +47,6 @@ stdenv.mkDerivation {
 
   meta = {
     platforms = stdenv.lib.platforms.linux;
+    broken = true; # 2018-09-21, build has failed since 2018-04-28
   };
 }