diff --git a/plugins/tools/selectiontools/KisMagneticWorker.cc b/plugins/tools/selectiontools/KisMagneticWorker.cc
index 9b55a79885..7058fda9d5 100644
--- a/plugins/tools/selectiontools/KisMagneticWorker.cc
+++ b/plugins/tools/selectiontools/KisMagneticWorker.cc
@@ -1,27 +1,28 @@
 /*
  *  Copyright (c) 2019 Kuntal Majumder <hellozee@disroot.org>
  *
  *  This library is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU Lesser General Public License as published by
  *  the Free Software Foundation; version 2.1 of the License.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU Lesser General Public License for more details.
  *
  *  You should have received a copy of the GNU Lesser General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
 #include "KisMagneticWorker.h"
 
 #include "kis_gaussian_kernel.h"
+#include <kis_painter.h>
 
 #include <QtCore>
 
 void KisMagneticWorker::run(KisPaintDeviceSP dev, const QRect &rect)
 {
     KisGaussianKernel::applyLoG(dev, rect, 2, -1.0, QBitArray(), 0);
 }
diff --git a/plugins/tools/selectiontools/tests/KisMagneticWorkerTest.cc b/plugins/tools/selectiontools/tests/KisMagneticWorkerTest.cc
index 1e05fa39df..eee069ef5b 100644
--- a/plugins/tools/selectiontools/tests/KisMagneticWorkerTest.cc
+++ b/plugins/tools/selectiontools/tests/KisMagneticWorkerTest.cc
@@ -1,49 +1,52 @@
 /*
  *  Copyright (c) 2019 Kuntal Majumder <hellozee@disroot.org>
  *
  *  This library is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU Lesser General Public License as published by
  *  the Free Software Foundation; version 2.1 of the License.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU Lesser General Public License for more details.
  *
  *  You should have received a copy of the GNU Lesser General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
 #include "KisMagneticWorkerTest.h"
 
 #include <KisMagneticWorker.h>
 #include <kis_paint_device.h>
 #include <kis_painter.h>
 #include <testutil.h>
 #include <kis_paint_device_debug_utils.h>
 
+#include <QDebug>
+
 inline KisPaintDeviceSP loadTestImage(const QString &name, bool convertToAlpha)
 {
     QImage image(TestUtil::fetchDataFileLazy(name));
     KisPaintDeviceSP dev = new KisPaintDevice(KoColorSpaceRegistry::instance()->rgb8());
     dev->convertFromQImage(image, 0);
 
     if (convertToAlpha) {
         dev = KisPainter::convertToAlphaAsAlpha(dev);
     }
 
     return dev;
 }
 
 void KisMagneticWorkerTest::testWorker()
 {
     KisPaintDeviceSP dev = loadTestImage("test_main.png", false);
     const QRect rect = dev->exactBounds();
+    KisPaintDeviceSP grayscaleDev = KisPainter::convertToAlphaAsGray(dev);
     KisMagneticWorker worker;
-    worker.run(dev, rect);
+    worker.run(grayscaleDev, rect);
 
-    KIS_DUMP_DEVICE_2(dev, rect, "main", "dd");
+    KIS_DUMP_DEVICE_2(grayscaleDev, rect, "main", "dd");
 }
 
 QTEST_MAIN(KisMagneticWorkerTest)
diff --git a/plugins/tools/selectiontools/tests/data/test_main.png b/plugins/tools/selectiontools/tests/data/test_main.png
new file mode 100644
index 0000000000..875f2a64de
Binary files /dev/null and b/plugins/tools/selectiontools/tests/data/test_main.png differ