diff --git a/autotests/karchivetest.cpp b/autotests/karchivetest.cpp
--- a/autotests/karchivetest.cpp
+++ b/autotests/karchivetest.cpp
@@ -19,6 +19,7 @@
 #include <kfilterdev.h>
 #include <qtemporarydir.h>
 #include <QRegularExpression>
+#include <QLoggingCategory>
 
 #ifndef Q_OS_WIN
 #include <unistd.h> // symlink
@@ -368,6 +369,7 @@
 
 void KArchiveTest::testEmptyFilename()
 {
+    QLoggingCategory::setFilterRules(QStringLiteral("kf5.karchive.warning=true"));
     QTest::ignoreMessage(QtWarningMsg, "KArchive: No file name specified");
     KTar tar(QLatin1String(""));
     QVERIFY(!tar.open(QIODevice::ReadOnly));
@@ -376,8 +378,10 @@
 
 void KArchiveTest::testNullDevice()
 {
-    QIODevice *nil = nullptr;
+    QLoggingCategory::setFilterRules(QStringLiteral("kf5.karchive.warning=true"));
     QTest::ignoreMessage(QtWarningMsg, "KArchive: Null device specified");
+
+    QIODevice *nil = nullptr;
     KTar tar(nil);
     QVERIFY(!tar.open(QIODevice::ReadOnly));
     QCOMPARE(tar.errorString(), tr("No filename or device was specified"));