--- a/channel.h	Fri Jan 01 09:46:09 2016 +0100
+++ b/channel.h	Fri Jan 01 16:30:31 2016 +0100
@@ -105,23 +105,23 @@
 void channel_connect_done(int result, int sock, void* user_data, const char* errstring);
 
 void chaninitialise(const struct ChanType *chantypes[]);
-void chancleanup();
+void chancleanup(void);
 void setchannelfds(fd_set *readfds, fd_set *writefds, int allow_reads);
 void channelio(fd_set *readfd, fd_set *writefd);
-struct Channel* getchannel();
+struct Channel* getchannel(void);
 /* Returns an arbitrary channel that is in a ready state - not
 being initialised and no EOF in either direction. NULL if none. */
-struct Channel* get_any_ready_channel();
+struct Channel* get_any_ready_channel(void);
 
-void recv_msg_channel_open();
-void recv_msg_channel_request();
+void recv_msg_channel_open(void);
+void recv_msg_channel_request(void);
 void send_msg_channel_failure(struct Channel *channel);
 void send_msg_channel_success(struct Channel *channel);
-void recv_msg_channel_data();
-void recv_msg_channel_extended_data();
-void recv_msg_channel_window_adjust();
-void recv_msg_channel_close();
-void recv_msg_channel_eof();
+void recv_msg_channel_data(void);
+void recv_msg_channel_extended_data(void);
+void recv_msg_channel_window_adjust(void);
+void recv_msg_channel_close(void);
+void recv_msg_channel_eof(void);
 
 void common_recv_msg_channel_data(struct Channel *channel, int fd, 
 		circbuffer * buf);
@@ -132,13 +132,13 @@
 
 #if defined(USING_LISTENERS) || defined(DROPBEAR_CLIENT)
 int send_msg_channel_open_init(int fd, const struct ChanType *type);
-void recv_msg_channel_open_confirmation();
-void recv_msg_channel_open_failure();
+void recv_msg_channel_open_confirmation(void);
+void recv_msg_channel_open_failure(void);
 #endif
 void start_send_channel_request(struct Channel *channel, char *type);
 
-void send_msg_request_success();
-void send_msg_request_failure();
+void send_msg_request_success(void);
+void send_msg_request_failure(void);
 
 
 #endif /* DROPBEAR_CHANNEL_H_ */