diff --git a/bin/joj3-forge-convert b/bin/joj3-forge-convert
index 38afe6e..ea253a4 100755
--- a/bin/joj3-forge-convert
+++ b/bin/joj3-forge-convert
@@ -2,11 +2,10 @@
 set -ex
 
 if [ -z "$1" ]; then
-  echo "error: course name is required" >&2
-  exit 1
+    COURSE=$(hostname | cut -d'/' -f2 | cut -d'-' -f1)
+else
+    COURSE="$1"
 fi
-
-COURSE="$1"
 CONFIG_REPO_PATH="/home/tt/.cache/$COURSE-config"
 GRADING_REPO_PATH="/home/tt/.cache/$COURSE-joj"
 GIT_USER="bot-$COURSE"