diff --git a/pkgs/development/python-modules/vdirsyncer/default.nix b/pkgs/development/python-modules/vdirsyncer/default.nix
index f1dc4418b268..70446323f1d9 100644
--- a/pkgs/development/python-modules/vdirsyncer/default.nix
+++ b/pkgs/development/python-modules/vdirsyncer/default.nix
@@ -85,5 +85,6 @@ buildPythonPackage rec {
     changelog = "https://github.com/pimutils/vdirsyncer/blob/v${version}/CHANGELOG.rst";
     license = licenses.bsd3;
     maintainers = with maintainers; [ loewenheim ];
+    mainProgram = "vdirsyncer";
   };
 }