diff --git a/ChangeLog b/ChangeLog
index 0ab85cf0..beebe6ad 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,9 @@
 ebus Daemon (ebusd) - ChangeLog
 ===============================
 
+2014-02-20:
+* Missing void declarations in various function parameter added.
+
 2014-01-22:
 * autogen.sh modified.
 
diff --git a/lib/ebus-bus.c b/lib/ebus-bus.c
index 1d7c930d..b907af4a 100644
--- a/lib/ebus-bus.c
+++ b/lib/ebus-bus.c
@@ -190,7 +190,7 @@ eb_raw_file_write(const unsigned char *buf, int buflen)
 
 
 int
-eb_serial_valid()
+eb_serial_valid(void)
 {
 	int serial;
 
@@ -1164,7 +1164,7 @@ eb_cyc_data_process(const unsigned char *buf, int buflen)
 }
 
 int
-eb_cyc_data_recv()
+eb_cyc_data_recv(void)
 {
 	static unsigned char msg[SERIAL_BUFSIZE];
 	static int msglen = 0;
diff --git a/lib/ebus-bus.h b/lib/ebus-bus.h
index b1bfa7a9..d3216c97 100644
--- a/lib/ebus-bus.h
+++ b/lib/ebus-bus.h
@@ -169,7 +169,7 @@ int eb_raw_file_write(const unsigned char *buf,  int buflen);
  * @brief Check if serial FD is vaild.
  * @return 0 ok | -1 error
  */
-int eb_serial_valid();
+int eb_serial_valid(void);
 
 /**
  * @brief Open serial device in raw mode. 1 Byte is then minimum input length.
@@ -327,7 +327,7 @@ int eb_cyc_data_process(const unsigned char *buf, int buflen);
  * @brief handle reading cycle ebus data
  * @return 0-x length of collected msg | -1 error
  */
-int eb_cyc_data_recv();
+int eb_cyc_data_recv(void);
 
 
 
diff --git a/lib/log.c b/lib/log.c
index aa27a58f..e4048252 100644
--- a/lib/log.c
+++ b/lib/log.c
@@ -101,7 +101,7 @@ log_open(const char *file, int foreground)
 }
 
 void
-log_close()
+log_close(void)
 {
 	if (logfp) {
 		fflush(logfp);
diff --git a/lib/log.h b/lib/log.h
index d70d3515..f0f08abd 100644
--- a/lib/log.h
+++ b/lib/log.h
@@ -49,7 +49,7 @@ void log_file(FILE *fp);
 void log_level(char *lvl);
 
 int log_open(const char *logfile, int foreground);
-void log_close();
+void log_close(void);
 
 void log_print(unsigned char lvl, const char *txt, ...);
 
diff --git a/tools/check.c b/tools/check.c
index 0cecf876..bb87ecfe 100644
--- a/tools/check.c
+++ b/tools/check.c
@@ -26,7 +26,7 @@
 
 #include "ebus-decode.h"
 
-int main() {
+int main(void) {
 
 	int i, j, end, ret;
 
diff --git a/tools/csv.c b/tools/csv.c
index 7253d01c..eb838e8d 100644
--- a/tools/csv.c
+++ b/tools/csv.c
@@ -42,7 +42,7 @@ static char loglevel[] = {"ALL"};
 
 
 void
-usage()
+usage(void)
 {
 	fprintf(stdout, "\nUsage: %s [OPTION] cfgdir\n\n"
 	"  -a --all      print ALL\n"
diff --git a/tools/ebus_send.c b/tools/ebus_send.c
index 27e02b12..224092a4 100644
--- a/tools/ebus_send.c
+++ b/tools/ebus_send.c
@@ -55,7 +55,7 @@ print_msg(const char *pre, const unsigned char *buf, int buflen,
 }
 
 void
-usage()
+usage(void)
 {
 	fprintf(stdout, "\nUsage: %s [OPTION] <ZZ PB SB NN DBx>\n\n"
 	"  <ZZ PB SB NN DBx>  spaces within message be removed.\n\n"