diff --git a/pkgs/development/python-modules/mypy/default.nix b/pkgs/development/python-modules/mypy/default.nix
index 2623f5c376a6..0528aeaec52b 100644
--- a/pkgs/development/python-modules/mypy/default.nix
+++ b/pkgs/development/python-modules/mypy/default.nix
@@ -125,6 +125,7 @@ buildPythonPackage rec {
     description = "Optional static typing for Python";
     homepage = "https://www.mypy-lang.org";
     license = licenses.mit;
+    mainProgram = "mypy";
     maintainers = with maintainers; [ martingms lnl7 ];
   };
 }