diff --git a/overlays/polymc.nix b/overlays/polymc.nix
index 197d027..83185dc 100644
--- a/overlays/polymc.nix
+++ b/overlays/polymc.nix
@@ -1,7 +1,9 @@
 self: super: {
-  polymc = super.polymc.overrideAttrs(_: rec {
+  polymc = super.polymc.overrideAttrs(old: rec {
     version = "1.1.0";
 
+    cmakeFlags = old.cmakeFlags ++ [ "-DLauncher_PORTABLE=0" ];
+
     src = self.fetchFromGitHub {
         owner = "PolyMC";
         repo = "PolyMC";