diff --git a/srcs/DccClient.cpp b/srcs/DccClient.cpp
index ffa86e9..86d98d9 100644
--- a/srcs/DccClient.cpp
+++ b/srcs/DccClient.cpp
@@ -63,8 +63,13 @@ int DccClient::init()
 		return (-1);
 	}
 
-	int flags = fcntl(_sockfd, F_GETFL, 0);
-	fcntl(_sockfd, F_SETFL, flags | O_NONBLOCK);
+	if (fcntl(_sockfd, F_SETFL, O_NONBLOCK) < 0)
+	{
+		std::cerr << "Error: setting socket DCC Client non-blocking" << std::endl;
+		close(_sockfd);
+		_sockfd = -1;
+		return (-1);
+	}
 
 	struct sockaddr_in serv_addr;
 	memset(&serv_addr, 0, sizeof(serv_addr));
diff --git a/srcs/DccServer.cpp b/srcs/DccServer.cpp
index 18c6294..1f54e36 100644
--- a/srcs/DccServer.cpp
+++ b/srcs/DccServer.cpp
@@ -42,8 +42,12 @@ int DccServer::init()
 	}
 
 	//config socket non-blocking
-	int flags = fcntl(_sockfd, F_GETFL, 0);
-	fcntl(_sockfd, F_SETFL, flags | O_NONBLOCK);
+	if (fcntl(_sockfd, F_SETFL, O_NONBLOCK) < 0)
+	{
+		std::cerr << "Error: setting socket DCC non-blocking" << std::endl;
+		close(_sockfd);
+		return (-1);
+	}
 
 	//config address
 	struct sockaddr_in addr;