diff --git a/pkgs/development/php-packages/grumphp/default.nix b/pkgs/development/php-packages/grumphp/default.nix
index 6367dd996bf2..62608a21acac 100644
--- a/pkgs/development/php-packages/grumphp/default.nix
+++ b/pkgs/development/php-packages/grumphp/default.nix
@@ -43,6 +43,7 @@ php.buildComposerProject (finalAttrs: {
     description = "A PHP code-quality tool";
     homepage = "https://github.com/phpro/grumphp";
     license = lib.licenses.mit;
+    mainProgram = "grumphp";
     maintainers = lib.teams.php.members;
   };
 })