diff --git a/app.js b/app.js
index 9ea0c9c..46f9367 100644
--- a/app.js
+++ b/app.js
@@ -23,11 +23,15 @@ let load = (name) => {
 };
 
 // environment variable check
-if(typeof process.env.DB_URL == 'undefined' || typeof process.env.DB_NAME == 'undefined') {
-	if(typeof process.env.DB_URL == 'undefined') console.error("environment variable DB_URL is not set");
-	if(typeof process.env.DB_NAME == 'undefined') console.error("environment variable DB_NAME is not set");
-	process.exit();
-}
+let env_vars = ["DB_URL", "DB_NAME"];
+let env_missing = false;
+env_vars.forEach((el) => {
+	if(typeof process.env[el] == 'undefined') {
+		console.error("environment variable "+el+" is not set");
+		env_missing = true;
+	}
+});
+if(env_missing) process.exit();
 
 global['modules'].events = load('events'); // event handler
 global['modules'].cli = load('cli'); // command line interface