diff --git a/act-runner/cgroup-helper.sh b/act-runner/cgroup-helper.sh
index dad34dd..6714c9e 100755
--- a/act-runner/cgroup-helper.sh
+++ b/act-runner/cgroup-helper.sh
@@ -18,7 +18,7 @@ function configure_cgroup() {
         echo 1 > /sys/fs/cgroup/${cgroup_name}/cgroup.procs
 
         if [ "$(wc -l < /sys/fs/cgroup/cgroup.procs)" != "0" ]; then
-            echo >&2 "warning: processes exist in the root cgroup; this may cause errors during cgroup initialization"
+            echo >&2 "WARNING: processes exist in the root cgroup; this may cause errors during cgroup initialization"
         fi
 
         root_cgroup_type="$(cat /sys/fs/cgroup/cgroup.type)"