diff --git a/nix/default.nix b/nix/default.nix
index dc9c0bb13..2db21b10d 100644
--- a/nix/default.nix
+++ b/nix/default.nix
@@ -224,6 +224,7 @@ in
           install hyprtester/pointer-warp -t $out/bin
           install hyprtester/pointer-scroll -t $out/bin
           install hyprland_gtests -t $out/bin
+          install hyprtester/child-window -t $out/binss
         ''}
       '';