1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/development/python-modules/online-judge-tools/default.nix b/pkgs/development/python-modules/online-judge-tools/default.nix
index 58d535e6ab78..a86b41145237 100644
--- a/pkgs/development/python-modules/online-judge-tools/default.nix
+++ b/pkgs/development/python-modules/online-judge-tools/default.nix
@@ -25,6 +25,7 @@ buildPythonPackage rec {
 
   meta = with lib; {
     description = "Tools for various online judges. Download sample cases, generate additional test cases, test your code, and submit it.";
+    mainProgram = "oj";
     homepage = "https://github.com/online-judge-tools/oj";
     license = licenses.mit;
     maintainers = with maintainers; [ sei40kr ];