diff --git a/pkgs/applications/networking/protonvpn-gui/default.nix b/pkgs/applications/networking/protonvpn-gui/default.nix
index f96c768d72a1..98f7ac541a78 100644
--- a/pkgs/applications/networking/protonvpn-gui/default.nix
+++ b/pkgs/applications/networking/protonvpn-gui/default.nix
@@ -70,6 +70,7 @@ buildPythonApplication rec {
     homepage = "https://github.com/ProtonVPN/linux-app";
     maintainers = with maintainers; [ wolfangaukang ];
     license = licenses.gpl3Plus;
+    mainProgram = "protonvpn";
     platforms = platforms.linux;
   };
 }