diff --git a/pkgs/tools/misc/esptool/default.nix b/pkgs/tools/misc/esptool/default.nix
index 2bf7b280d254..d7bf8a9b9031 100644
--- a/pkgs/tools/misc/esptool/default.nix
+++ b/pkgs/tools/misc/esptool/default.nix
@@ -46,5 +46,6 @@ python3.pkgs.buildPythonApplication rec {
     license = licenses.gpl2Plus;
     maintainers = with maintainers; [ dezgeg dotlambda ] ++ teams.lumiguide.members;
     platforms = with platforms; linux ++ darwin;
+    mainProgram = "esptool.py";
   };
 }