diff --git a/apps/user_ldap/lib/Jobs/Sync.php b/apps/user_ldap/lib/Jobs/Sync.php
index 38eba5ca4b..7a1f7703e5 100644
--- a/apps/user_ldap/lib/Jobs/Sync.php
+++ b/apps/user_ldap/lib/Jobs/Sync.php
@@ -118,7 +118,7 @@ class Sync extends TimedJob {
 	/**
 	 * @param array $argument
 	 */
-	protected function run($argument) {
+	public function run($argument) {
 		$this->setArgument($argument);
 
 		$isBackgroundJobModeAjax = $this->config
@@ -252,7 +252,7 @@ class Sync extends TimedJob {
 	 * @param $cycleData
 	 * @return bool
 	 */
-	protected function qualifiesToRun($cycleData) {
+	public function qualifiesToRun($cycleData) {
 		$lastChange = $this->config->getAppValue('user_ldap', $cycleData['prefix'] . '_lastChange', 0);
 		if((time() - $lastChange) > 60 * 30) {
 			return true;
diff --git a/apps/user_ldap/tests/Jobs/SyncTest.php b/apps/user_ldap/tests/Jobs/SyncTest.php
index 338b1210a9..68a7887c12 100644
--- a/apps/user_ldap/tests/Jobs/SyncTest.php
+++ b/apps/user_ldap/tests/Jobs/SyncTest.php
@@ -197,11 +197,15 @@ class SyncTest extends TestCase {
 	}
 
 	public function cycleDataProvider() {
-		$cycle1 = ['prefix' => 's01', 'offset' => 1000];
+		$lastCycle = ['prefix' => 's01', 'offset' => 1000];
+		$lastCycle2 = ['prefix' => '', 'offset' => 1000];
 		return [
 			[ null, ['s01'], ['prefix' => 's01', 'offset' => 0] ],
-			[ $cycle1, ['s01', 's02'], ['prefix' => 's02', 'offset' => 0] ],
-			[ $cycle1, [], null ],
+			[ null, [''], ['prefix' => '', 'offset' => 0] ],
+			[ $lastCycle, ['s01', 's02'], ['prefix' => 's02', 'offset' => 0] ],
+			[ $lastCycle, [''], ['prefix' => '', 'offset' => 0] ],
+			[ $lastCycle2, ['', 's01'], ['prefix' => 's01', 'offset' => 0] ],
+			[ $lastCycle, [], null ],
 		];
 	}
 
@@ -237,4 +241,16 @@ class SyncTest extends TestCase {
 		}
 	}
 
+	public function testQualifiesToRun() {
+		$cycleData = ['prefix' => 's01'];
+
+		$this->config->expects($this->exactly(2))
+			->method('getAppValue')
+			->willReturnOnConsecutiveCalls(time() - 60*40, time() - 60*20);
+
+		$this->sync->setArgument($this->arguments);
+		$this->assertTrue($this->sync->qualifiesToRun($cycleData));
+		$this->assertFalse($this->sync->qualifiesToRun($cycleData));
+	}
+
 }