diff --git a/connection.cc b/connection.cc
index 0a467c7..206a1ef 100644
--- a/connection.cc
+++ b/connection.cc
@@ -1,7 +1,8 @@
 #include <cassert>
-#include <cstdlib>
+#include <cstdio>
 #include <cstring>
 #include <iostream>
+#include <unistd.h>
 
 #include "agent.h"
 #include "connection.h"
diff --git a/connection.h b/connection.h
index 3067188..1d1941e 100644
--- a/connection.h
+++ b/connection.h
@@ -1,7 +1,7 @@
 #ifndef BRMLIFE__CONNECTION_H
 #define BRMLIFE__CONNECTION_H
 
-#include <cstdio>
+#include <unistd.h>
 
 #include "map.h"
 
@@ -11,6 +11,11 @@ public:
 
 	connection(int fd_) : fd(fd_) {}
 
+	~connection()
+	{
+		close(fd);
+	}
+
 	void senses(int tick_id, char around[4]);
 };