[OPENMEETINGS-2520] sonar should be more happy
diff --git a/openmeetings-web/src/test/java/org/apache/openmeetings/cli/TestAdmin.java b/openmeetings-web/src/test/java/org/apache/openmeetings/cli/TestAdmin.java
index ff1ea1f..432f235 100644
--- a/openmeetings-web/src/test/java/org/apache/openmeetings/cli/TestAdmin.java
+++ b/openmeetings-web/src/test/java/org/apache/openmeetings/cli/TestAdmin.java
@@ -132,7 +132,7 @@
 		a.process("-b");
 		//backup to file
 		File backup = Files.createTempFile("omtempbackup", null).toFile();
-		a.process("-b", backup.getCanonicalPath());
+		a.process("-b", "-file", backup.getCanonicalPath());
 		assertTrue(backup.exists(), "backup Should be created");
 		assertTrue(Files.size(backup.toPath()) > 0, "backup shouldn't be empty");
 	}