diff --git a/lam/lib/account.inc b/lam/lib/account.inc
index c216d6b7..497e199a 100644
--- a/lam/lib/account.inc
+++ b/lam/lib/account.inc
@@ -1751,6 +1751,16 @@ function getLAMVersionText() {
 	return $text . ' - ' . LAMVersion();
 }
 
+/**
+ * Returns if the given release is a developer version.
+ *
+ * @param string version
+ * @return bool is developer version
+ */
+function isDeveloperVersion($version) {
+	return strpos($version, 'DEV') !== false;
+}
+
 /**
  * LAM exception with title and message.
  *
diff --git a/lam/templates/config/index.php b/lam/templates/config/index.php
index 48d4fef2..1aa9544f 100644
--- a/lam/templates/config/index.php
+++ b/lam/templates/config/index.php
@@ -2,7 +2,7 @@
 /*
 
   This code is part of LDAP Account Manager (http://www.ldap-account-manager.org/)
-  Copyright (C) 2003 - 2019  Roland Gruber
+  Copyright (C) 2003 - 2020  Roland Gruber
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
diff --git a/lam/tests/lib/accountTest.php b/lam/tests/lib/accountTest.php
index bca309c1..b33623bd 100644
--- a/lam/tests/lib/accountTest.php
+++ b/lam/tests/lib/accountTest.php
@@ -24,7 +24,7 @@ include_once __DIR__ . '/../../lib/account.inc';
 include_once __DIR__ . '/../../lib/security.inc';
 
 /**
- * LAMConfig test case.
+ * account.inc test cases.
  *
  * @author Roland Gruber
  */
@@ -155,4 +155,13 @@ class AccountTest extends TestCase {
 		$this->assertFalse(isCommandlineSafeEmailAddress('test+abc@example.com'));
 	}
 
+	/**
+	 * Tests isDeveloperVersion()
+	 */
+	function testIsDeveloperVersion() {
+		$this->assertFalse(isDeveloperVersion('0.4.1'));
+		$this->assertFalse(isDeveloperVersion('3.2.RC1'));
+		$this->assertTrue(isDeveloperVersion('4.5.DEV'));
+	}
+
 }