diff --git a/libaegisub/include/libaegisub/signal.h b/libaegisub/include/libaegisub/signal.h
index ca520e49f..091cc7873 100644
--- a/libaegisub/include/libaegisub/signal.h
+++ b/libaegisub/include/libaegisub/signal.h
@@ -100,6 +100,7 @@ namespace detail {
 		SignalBase& operator=(SignalBase const&) = delete;
 	protected:
 		SignalBase() = default;
+		virtual ~SignalBase() {};
 		/// @brief Notify a slot that it has been disconnected
 		/// @param tok Token to disconnect
 		///