diff --git a/core/dbunionsearch.class.php b/core/dbunionsearch.class.php
index 8d8d73684d..a9c4beba87 100644
--- a/core/dbunionsearch.class.php
+++ b/core/dbunionsearch.class.php
@@ -59,7 +59,7 @@ public function __construct($aSearches)
 	public function AllowAllData($bAllowAllData = true)
 	{
 		foreach ($this->aSearches as $oSearch) {
-			$oSearch->AllowAllData();
+			$oSearch->AllowAllData($bAllowAllData);
 		}
 	}
 
diff --git a/tests/php-unit-tests/unitary-tests/core/DBUnionSearchTest.php b/tests/php-unit-tests/unitary-tests/core/DBUnionSearchTest.php
index e6501c7c18..cf310971ef 100644
--- a/tests/php-unit-tests/unitary-tests/core/DBUnionSearchTest.php
+++ b/tests/php-unit-tests/unitary-tests/core/DBUnionSearchTest.php
@@ -183,4 +183,14 @@ public function SetSelectedClassesProvider()
 			],
 		];
 	}
+
+	public function testAllowAllDataOnUnions()
+	{
+		$oSearch = \DBObjectSearch::FromOQL('SELECT Server UNION SELECT VirtualMachine');
+		$oSearch->AllowAllData(false);
+		self::assertFalse($oSearch->IsAllDataAllowed(), 'DBUnionSearch AllowData value');
+		$oSearch->AllowAllData(true);
+		self::assertTrue($oSearch->IsAllDataAllowed(), 'DBUnionSearch AllowData value');
+	}
+
 }