diff --git a/src/plugins/projectexplorer/devicesupport/devicetestdialog.cpp b/src/plugins/projectexplorer/devicesupport/devicetestdialog.cpp
index 3c28a48fd14..3b8da368224 100644
--- a/src/plugins/projectexplorer/devicesupport/devicetestdialog.cpp
+++ b/src/plugins/projectexplorer/devicesupport/devicetestdialog.cpp
@@ -71,8 +71,10 @@ DeviceTestDialog::~DeviceTestDialog() = default;
 
 void DeviceTestDialog::reject()
 {
-    if (!d->finished)
+    if (!d->finished) {
+        d->deviceTester->disconnect(this);
         d->deviceTester->stopTest();
+    }
     QDialog::reject();
 }