diff --git a/build/entrypoint.sh b/build/entrypoint.sh
index ab54583..55f7fc5 100644
--- a/build/entrypoint.sh
+++ b/build/entrypoint.sh
@@ -7,9 +7,8 @@
 # tests see the FATAL text rather than an earlier set -e abort).
 set -e
 # #region agent log
-# Debug: CI showed exit=1 with empty docker logs after /data/opendkim was
-# created — surface the failing line under set -e (session 816647).
-trap 'echo "entrypoint: command failed at line $LINENO (exit $?)" >&2' ERR
+# Debug (session 816647): dash does not support `trap … ERR` ("bad trap" then
+# set -e aborts before hostname checks). Step echoes only — portable on /bin/sh.
 step() { echo "entrypoint: $*" >&2; }
 # #endregion