diff --git a/3.9-rc/alpine/docker-entrypoint.sh b/3.9-rc/alpine/docker-entrypoint.sh
index 4009d3d9..b1951f2e 100755
--- a/3.9-rc/alpine/docker-entrypoint.sh
+++ b/3.9-rc/alpine/docker-entrypoint.sh
@@ -16,6 +16,7 @@ deprecatedEnvVars=(
 	RABBITMQ_DEFAULT_USER
 	RABBITMQ_DEFAULT_USER_FILE
 	RABBITMQ_DEFAULT_VHOST
+	RABBITMQ_ERLANG_COOKIE
 	RABBITMQ_MANAGEMENT_SSL_CACERTFILE
 	RABBITMQ_MANAGEMENT_SSL_CERTFILE
 	RABBITMQ_MANAGEMENT_SSL_DEPTH
diff --git a/3.9-rc/ubuntu/docker-entrypoint.sh b/3.9-rc/ubuntu/docker-entrypoint.sh
index 5161e8e2..d5234117 100755
--- a/3.9-rc/ubuntu/docker-entrypoint.sh
+++ b/3.9-rc/ubuntu/docker-entrypoint.sh
@@ -16,6 +16,7 @@ deprecatedEnvVars=(
 	RABBITMQ_DEFAULT_USER
 	RABBITMQ_DEFAULT_USER_FILE
 	RABBITMQ_DEFAULT_VHOST
+	RABBITMQ_ERLANG_COOKIE
 	RABBITMQ_MANAGEMENT_SSL_CACERTFILE
 	RABBITMQ_MANAGEMENT_SSL_CERTFILE
 	RABBITMQ_MANAGEMENT_SSL_DEPTH
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index 5161e8e2..d5234117 100755
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -16,6 +16,7 @@ deprecatedEnvVars=(
 	RABBITMQ_DEFAULT_USER
 	RABBITMQ_DEFAULT_USER_FILE
 	RABBITMQ_DEFAULT_VHOST
+	RABBITMQ_ERLANG_COOKIE
 	RABBITMQ_MANAGEMENT_SSL_CACERTFILE
 	RABBITMQ_MANAGEMENT_SSL_CERTFILE
 	RABBITMQ_MANAGEMENT_SSL_DEPTH