1 files changed, 2 insertions, 0 deletions
diff --git a/src/lib/image.h b/src/lib/image.h
index 00768ee02..39d84fcd4 100644
--- a/src/lib/image.h
+++ b/src/lib/image.h
@@ -91,6 +91,8 @@ protected:
 	virtual void swap (Image &);
 	float bytes_per_pixel (int) const;
 
+	friend class pixel_formats_test;
+
 private:
 	void yuv_16_black (uint16_t);
 	static uint16_t swap_16 (uint16_t);