diff --git a/src/plugins/projectexplorer/devicesupport/idevice.h b/src/plugins/projectexplorer/devicesupport/idevice.h
index 493b7b306e4..d917fc18636 100644
--- a/src/plugins/projectexplorer/devicesupport/idevice.h
+++ b/src/plugins/projectexplorer/devicesupport/idevice.h
@@ -211,7 +211,7 @@ protected:
     IDevice(const IDevice &other);
 
 private:
-    IDevice &operator=(const IDevice &); // Unimplemented.
+    IDevice &operator=(const IDevice &) = delete;
 
     int version() const;