diff --git a/nix/packages/owmods-gui.nix b/nix/packages/owmods-gui.nix
index ef92eddc..ba2527db 100644
--- a/nix/packages/owmods-gui.nix
+++ b/nix/packages/owmods-gui.nix
@@ -108,7 +108,7 @@ rustPlatform.buildRustPackage rec {
   desktopItems = [
     (makeDesktopItem {
       name = "outer-wilds-mod-manager";
-      exec = "outer-wilds-mod-manager %U";
+      exec = "outer-wilds-mod-manager %u";
       icon = "outer-wilds-mod-manager";
       desktopName = "Outer Wilds Mod Manager";
       categories = ["Game"];
diff --git a/owmods_gui/backend/template.desktop b/owmods_gui/backend/template.desktop
index d56a80e6..063c11cf 100644
--- a/owmods_gui/backend/template.desktop
+++ b/owmods_gui/backend/template.desktop
@@ -3,7 +3,7 @@ Categories={{categories}}
 {{#if comment}}
 Comment={{comment}}
 {{/if}}
-Exec={{exec}} %U
+Exec={{exec}} %u
 StartupWMClass={{exec}}
 Icon={{icon}}
 Name={{name}}