diff --git a/pkgs/tools/backup/duplicity/default.nix b/pkgs/tools/backup/duplicity/default.nix
index fd5c7c60f0c9..180869730be6 100644
--- a/pkgs/tools/backup/duplicity/default.nix
+++ b/pkgs/tools/backup/duplicity/default.nix
@@ -150,6 +150,7 @@ let self = python3.pkgs.buildPythonApplication rec {
     description = "Encrypted bandwidth-efficient backup using the rsync algorithm";
     homepage = "https://duplicity.gitlab.io/duplicity-web/";
     license = licenses.gpl2Plus;
+    mainProgram = "duplicity";
     maintainers = with maintainers; [ corngood ];
   };
 };