diff --git a/bitnami/nginx/1.16/debian-9/rootfs/libnginx.sh b/bitnami/nginx/1.16/debian-9/rootfs/libnginx.sh
index 5a3ca1ebc2b8..47f2310b65f7 100644
--- a/bitnami/nginx/1.16/debian-9/rootfs/libnginx.sh
+++ b/bitnami/nginx/1.16/debian-9/rootfs/libnginx.sh
@@ -111,7 +111,7 @@ nginx_config_http_port() {
     local http_port=${1:-8080}
     debug "Configuring default HTTP port..."
     # TODO: find an appropriate NGINX parser to avoid 'sed calls'
-    sed -i -r "s/(listen\s+)[0-9]{1,5};/\1${http_port};/g" ${NGINX_CONFDIR}/nginx.conf
+    sed -i -E "s/(listen\s+)[0-9]{1,5};/\1${http_port};/g" ${NGINX_CONFDIR}/nginx.conf
 }
 
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