diff --git a/Inputs/Keyboard.hpp b/Inputs/Keyboard.hpp
index 56105b279..0b4a4120c 100644
--- a/Inputs/Keyboard.hpp
+++ b/Inputs/Keyboard.hpp
@@ -46,6 +46,8 @@ class Keyboard {
 		/// Constructs a Keyboard that declares itself to observe only members of @c observed_keys.
 		Keyboard(const std::set<Key> &observed_keys, const std::set<Key> &essential_modifiers);
 
+		virtual ~Keyboard() {}
+
 		// Host interface.
 
 		/// @returns @c true if the key press affects the machine; @c false otherwise.