diff --git a/pkgs/by-name/um/umu-launcher/package.nix b/pkgs/by-name/um/umu-launcher/package.nix
index a282d7d3e2ab..8c1c23d66d8e 100644
--- a/pkgs/by-name/um/umu-launcher/package.nix
+++ b/pkgs/by-name/um/umu-launcher/package.nix
@@ -32,6 +32,11 @@ buildFHSEnv {
   executableName = umu-launcher-unwrapped.meta.mainProgram;
   runScript = lib.getExe umu-launcher-unwrapped;
 
+  # Legendary spawns UMU, doesn't wait for it to exit,
+  # and immediately exits itself. This makes it so we can't
+  # die with parent, because parent is already dead.
+  dieWithParent = false;
+
   extraInstallCommands = ''
     ln -s ${umu-launcher-unwrapped}/lib $out/lib
     ln -s ${umu-launcher-unwrapped}/share $out/share