diff --git a/src/Cedar/Cedar.h b/src/Cedar/Cedar.h
index 1352bcea..853e361b 100644
--- a/src/Cedar/Cedar.h
+++ b/src/Cedar/Cedar.h
@@ -274,7 +274,7 @@
 #define	MAX_RETRY_INTERVAL			(300 * 1000)	// Maximum retry interval
 #define	RETRY_INTERVAL_SPECIAL		(60 * 1000)		// Reconnection interval of a special case
 
-#define	MAX_ADDITONAL_CONNECTION_FAILED_COUNTER	16	// Allowable number that can be serially failed to additional connection
+#define	MAX_ADDITIONAL_CONNECTION_FAILED_COUNTER	16	// Allowable number that can be serially failed to additional connection
 #define	ADDITIONAL_CONNECTION_COUNTER_RESET_INTERVAL	(30 * 60 * 1000)	// Reset period of additional connection failure counter
 
 #define	MAC_MIN_LIMIT_COUNT			3		// Minimum number of MAC addresses
diff --git a/src/Cedar/Protocol.c b/src/Cedar/Protocol.c
index 77f3c592..2d881d31 100644
--- a/src/Cedar/Protocol.c
+++ b/src/Cedar/Protocol.c
@@ -6492,7 +6492,7 @@ SOCK *ClientConnectGetSocket(CONNECTION *c, bool additional_connect, bool no_tls
 	volatile bool *cancel_flag = NULL;
 	void *hWnd;
 	UINT nat_t_err = 0;
-	bool is_additonal_rudp_session = false;
+	bool is_additional_rudp_session = false;
 	UCHAR uc = 0;
 	IP ret_ip;
 	// Validate arguments
@@ -6508,7 +6508,7 @@ SOCK *ClientConnectGetSocket(CONNECTION *c, bool additional_connect, bool no_tls
 	if (sess != NULL)
 	{
 		cancel_flag = &sess->CancelConnect;
-		is_additonal_rudp_session = sess->IsRUDPSession;
+		is_additional_rudp_session = sess->IsRUDPSession;
 	}
 
 	hWnd = c->hWndForUI;
@@ -6552,7 +6552,7 @@ SOCK *ClientConnectGetSocket(CONNECTION *c, bool additional_connect, bool no_tls
 				// If additional_connect == false, enable trying to NAT-T connection
 				// If additional_connect == true, follow the IsRUDPSession setting in this session
 				s = TcpIpConnectEx(host_for_direct_connection, port_for_direct_connection,
-					(bool *)cancel_flag, hWnd, &nat_t_err, (additional_connect ? (!is_additonal_rudp_session) : false),
+					(bool *)cancel_flag, hWnd, &nat_t_err, (additional_connect ? (!is_additional_rudp_session) : false),
 					true, no_tls, &ret_ip);
 			}
 		}
diff --git a/src/Cedar/Session.c b/src/Cedar/Session.c
index 5475485a..63b1e566 100644
--- a/src/Cedar/Session.c
+++ b/src/Cedar/Session.c
@@ -980,7 +980,7 @@ void ClientAdditionalConnectChance(SESSION *s)
 		return;
 	}
 
-	if (s->IsRUDPSession && (s->Connection->AdditionalConnectionFailedCounter > MAX_ADDITONAL_CONNECTION_FAILED_COUNTER))
+	if (s->IsRUDPSession && (s->Connection->AdditionalConnectionFailedCounter > MAX_ADDITIONAL_CONNECTION_FAILED_COUNTER))
 	{
 		// Not to make a large amount of repeated connection retry within a certain time in the case of R-UDP session
 		return;