diff --git a/src/libcamera/include/v4l2_device.h b/src/libcamera/include/v4l2_device.h
index 413bb7f..c67ebbf 100644
--- a/src/libcamera/include/v4l2_device.h
+++ b/src/libcamera/include/v4l2_device.h
@@ -62,7 +62,7 @@ public:
 	V4L2Device(const V4L2Device &) = delete;
 	~V4L2Device();

-	void operator=(const V4L2Device &) = delete;
+	V4L2Device &operator=(const V4L2Device &) = delete;

 	int open();
 	bool isOpen() const;