diff --git a/pkgs/games/steam/fhsenv.nix b/pkgs/games/steam/fhsenv.nix
index eb90c6dd24da..447ff94bf9d3 100644
--- a/pkgs/games/steam/fhsenv.nix
+++ b/pkgs/games/steam/fhsenv.nix
@@ -117,6 +117,7 @@ in buildFHSUserEnv rec {
     xorg.xkeyboardconfig
     xorg.libpciaccess
     udev # shadow of the tomb raider
+    icu # dotnet runtime, e.g. stardew valley
 
     # screeps dependencies
     gtk3