diff --git a/cpp/Testable.h b/cpp/Testable.h
index 78b6ee011..e03e05db3 100644
--- a/cpp/Testable.h
+++ b/cpp/Testable.h
@@ -19,6 +19,7 @@ namespace gtsam {
 	class Testable {
 
 	public:
+	    virtual ~Testable() {};
 
 		/**
 		 * print