diff --git a/src/reverseproxy.js b/src/reverseproxy.js
index e662b73d4..d2463b41d 100644
--- a/src/reverseproxy.js
+++ b/src/reverseproxy.js
@@ -478,7 +478,7 @@ function writeAppNginxConfig(app, fqdn, bundle, callback) {
     };
     var nginxConf = ejs.render(NGINX_APPCONFIG_EJS, data);
 
-    const aliasSuffix = app.fqdn === fqdn ? '' : `-alias-${fqdn}`;
+    const aliasSuffix = app.fqdn === fqdn ? '' : `-alias-${fqdn.replace('*', '_')}`;
     var nginxConfigFilename = path.join(paths.NGINX_APPCONFIG_DIR, `${app.id}${aliasSuffix}.conf`);
     debug('writeAppNginxConfig: writing config for "%s" to %s with options %j', fqdn, nginxConfigFilename, data);
 
@@ -626,7 +626,7 @@ function renewCerts(options, auditSource, progressCallback, callback) {
             });
 
             app.aliasDomains.forEach(function (aliasDomain) {
-                const nginxConfigFilename = path.join(paths.NGINX_APPCONFIG_DIR, `${app.id}-alias-${aliasDomain.fqdn}.conf`);
+                const nginxConfigFilename = path.join(paths.NGINX_APPCONFIG_DIR, `${app.id}-alias-${aliasDomain.fqdn.replace('*', '_')}.conf`);
                 appDomains.push({ domain: aliasDomain.domain, fqdn: aliasDomain.fqdn, type: 'alias', app: app, nginxConfigFilename });
             });
         });