diff --git a/include/td/misc/Signal.h b/include/td/misc/Signal.h
index 9c3c491..fe43824 100644
--- a/include/td/misc/Signal.h
+++ b/include/td/misc/Signal.h
@@ -2,6 +2,7 @@
 
 #include <algorithm>
 #include <functional>
+#include <memory>
 #include <td/common/NonCopyable.h>
 #include <vector>
 
@@ -55,7 +56,7 @@ class Signal {
   public:
 	Signal() : m_Signal(std::make_shared<SignalBase>()) {}
 	Signal(const Signal&) = default;
-	
+
 	/**
 	 * \warning The callback won't be disconnectable, use it wisely!
 	 */
@@ -91,7 +92,8 @@ class Signal<Args...>::ConnectionGuard : public Connection {
 	CallBack m_Callback;
 
   public:
-	ConnectionGuard(const Signal<Args...>& a_Signal, const CallBack& a_Callback) : m_Signal(a_Signal.m_Signal), m_Callback(a_Callback) {}
+	ConnectionGuard(const Signal<Args...>& a_Signal, const CallBack& a_Callback) :
+		m_Signal(a_Signal.m_Signal), m_Callback(a_Callback) {}
 
 	~ConnectionGuard() {
 		if (!m_Signal.expired())