diff --git a/pkgs/development/tools/espup/default.nix b/pkgs/development/tools/espup/default.nix
index ad304e1861c0..fdc21ffe63ec 100644
--- a/pkgs/development/tools/espup/default.nix
+++ b/pkgs/development/tools/espup/default.nix
@@ -71,5 +71,6 @@ rustPlatform.buildRustPackage rec {
     homepage = "https://github.com/esp-rs/espup/";
     license = with licenses; [ mit asl20 ];
     maintainers = with maintainers; [ knightpp ];
+    mainProgram = "espup";
   };
 }