--- a/session.h	Fri Jan 01 09:46:09 2016 +0100
+++ b/session.h	Fri Jan 01 16:30:31 2016 +0100
@@ -45,14 +45,14 @@
 
 void common_session_init(int sock_in, int sock_out);
 void session_loop(void(*loophandler)()) ATTRIB_NORETURN;
-void session_cleanup();
-void send_session_identification();
-void send_msg_ignore();
-void ignore_recv_response();
+void session_cleanup(void);
+void send_session_identification(void);
+void send_msg_ignore(void);
+void ignore_recv_response(void);
 
-void update_channel_prio();
+void update_channel_prio(void);
 
-const char* get_user_shell();
+const char* get_user_shell(void);
 void fill_passwd(const char* username);
 
 /* Server */
@@ -64,7 +64,7 @@
 void cli_session(int sock_in, int sock_out, struct dropbear_progress_connection *progress, pid_t proxy_cmd_pid) ATTRIB_NORETURN;
 void cli_connected(int result, int sock, void* userdata, const char *errstring);
 void cleantext(char* dirtytext);
-void kill_proxy_command();
+void kill_proxy_command(void);
 
 /* crypto parameters that are stored individually for transmit and receive */
 struct key_context_directional {
@@ -189,11 +189,11 @@
 	   concluded (ie, while dataallowed was unset)*/
 	struct packetlist *reply_queue_head, *reply_queue_tail;
 
-	void(*remoteclosed)(); /* A callback to handle closure of the
+	void(*remoteclosed)(void); /* A callback to handle closure of the
 									  remote connection */
 
-	void(*extra_session_cleanup)(); /* client or server specific cleanup */
-	void(*send_kex_first_guess)();
+	void(*extra_session_cleanup)(void); /* client or server specific cleanup */
+	void(*send_kex_first_guess)(void);
 
 	struct AuthState authstate; /* Common amongst client and server, since most
 								   struct elements are common */