diff --git a/joj3_config_generator/processers/repo.py b/joj3_config_generator/processers/repo.py
index 90617a0..5b168fe 100644
--- a/joj3_config_generator/processers/repo.py
+++ b/joj3_config_generator/processers/repo.py
@@ -54,8 +54,7 @@ def get_teapot_check_args(repo_conf: repo.Config) -> List[str]:
             + f"{repo_conf.groups.max_count[i]}:"
             + f"{repo_conf.groups.time_period_hour[i]},"
         )
-    # default value hardcoded
-    group_config = group_config + "=100:24"
+    group_config = group_config.removesuffix(",")
     return [
         "/usr/local/bin/joint-teapot",
         "joj3-check-env",
diff --git a/tests/convert/basic/task.json b/tests/convert/basic/task.json
index 0580b0d..bc3483b 100644
--- a/tests/convert/basic/task.json
+++ b/tests/convert/basic/task.json
@@ -74,7 +74,7 @@
                                     "--grading-repo-name",
                                     "ece280-joj",
                                     "--group-config",
-                                    "joj=1000:24,run=1000:24,=100:24"
+                                    "joj=1000:24,run=1000:24"
                                 ],
                                 "env": [
                                     "LOG_FILE_PATH=/home/tt/.cache/joint-teapot-debug.log"