diff --git a/artiq-fast/vivado.nix b/artiq-fast/vivado.nix
index f6e5f41..bef83d0 100644
--- a/artiq-fast/vivado.nix
+++ b/artiq-fast/vivado.nix
@@ -6,8 +6,15 @@
 pkgs.buildFHSUserEnv {
   name = "vivado";
   targetPkgs = pkgs: (
-    with pkgs; [
-      ncurses5
+    with pkgs; let
+    # Apply patch from https://github.com/nix-community/nix-environments/pull/54
+    # to fix ncurses libtinfo.so's soname issue
+      ncurses' = ncurses5.overrideAttrs (old: {
+        configureFlags = old.configureFlags ++ [ "--with-termlib" ];
+        postFixup = "";
+      });
+    in [
+      (ncurses'.override { unicodeSupport = false; })
       zlib
       libuuid
       xorg.libSM