diff --git a/Inputs/Keyboard.cpp b/Inputs/Keyboard.cpp
index c479c6a7f..6acfec9bc 100644
--- a/Inputs/Keyboard.cpp
+++ b/Inputs/Keyboard.cpp
@@ -24,7 +24,7 @@ void Keyboard::set_key_pressed(Key key, bool is_pressed) {
 
 void Keyboard::reset_all_keys() {
 	std::fill(key_states_.begin(), key_states_.end(), false);
-	if(delegate_) delegate_->reset_all_keys();
+	if(delegate_) delegate_->reset_all_keys(this);
 }
 
 void Keyboard::set_delegate(Delegate *delegate) {
diff --git a/Inputs/Keyboard.hpp b/Inputs/Keyboard.hpp
index 7d480c8c8..0506be2b0 100644
--- a/Inputs/Keyboard.hpp
+++ b/Inputs/Keyboard.hpp
@@ -46,11 +46,11 @@ class Keyboard {
 		// Delegate interface.
 		struct Delegate {
 			virtual void keyboard_did_change_key(Keyboard *keyboard, Key key, bool is_pressed) = 0;
-			virtual void reset_all_keys() = 0;
+			virtual void reset_all_keys(Keyboard *keyboard) = 0;
 		};
 		void set_delegate(Delegate *delegate);
 		bool get_key_state(Key key);
-	
+
 	private:
 		std::vector<bool> key_states_;
 		Delegate *delegate_ = nullptr;
diff --git a/Machines/KeyboardMachine.cpp b/Machines/KeyboardMachine.cpp
index 36299cd13..c6562bee4 100644
--- a/Machines/KeyboardMachine.cpp
+++ b/Machines/KeyboardMachine.cpp
@@ -19,7 +19,7 @@ void Machine::keyboard_did_change_key(Inputs::Keyboard *keyboard, Inputs::Keyboa
 	if(mapped_key != KeyNotMapped) set_key_state(mapped_key, is_pressed);
 }
 
-void Machine::reset_all_keys() {
+void Machine::reset_all_keys(Inputs::Keyboard *keyboard) {
 	// TODO: unify naming.
 	clear_all_keys();
 }
diff --git a/Machines/KeyboardMachine.hpp b/Machines/KeyboardMachine.hpp
index a509002a6..0074a3ee2 100644
--- a/Machines/KeyboardMachine.hpp
+++ b/Machines/KeyboardMachine.hpp
@@ -59,8 +59,8 @@ class Machine: public Inputs::Keyboard::Delegate {
 		virtual KeyboardMapper &get_keyboard_mapper() = 0;
 
 	private:
-		void keyboard_did_change_key(Inputs::Keyboard *keyboard, Inputs::Keyboard::Key key, bool is_pressed);
-		void reset_all_keys();
+		void keyboard_did_change_key(Inputs::Keyboard *keyboard, Inputs::Keyboard::Key key, bool is_pressed) override;
+		void reset_all_keys(Inputs::Keyboard *keyboard) override;
 		Inputs::Keyboard keyboard_;
 };