1 files changed, 1 insertions, 1 deletions
diff --git a/src/image.h b/src/image.h
index 81458021..7033564f 100644
--- a/src/image.h
+++ b/src/image.h
@@ -38,7 +38,7 @@ public:
 	}
 
 protected:
-	void swap (Image& other);
+	virtual void swap (Image& other);
 	
 	Size _size;
 };