diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index e0a2c8ba..9e3ddc10 100755
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -48,7 +48,8 @@ file_env PHP_INI_MEMORY_LIMIT 512M
 
 # Set essential PHP_INI configuration
 # It is important to set essential variables like 'memory-limit' before the first start to premvent OOM during installation and statup.
-echo "memory_limit=${PHP_INI_MEMORY_LIMIT}" > /usr/local/etc/php/conf.d/memory-limit.ini;
+file_memory_limit=/usr/local/etc/php/conf.d/memory-limit.ini
+[ -s ${file_memory_limit} ] || echo "memory_limit=${PHP_INI_MEMORY_LIMIT}" > ${file_memory_limit}
 
 if expr "$1" : "apache" 1>/dev/null; then
     if [ -n "${APACHE_DISABLE_REWRITE_IP+x}" ]; then