diff --git a/clock.c b/clock.c
index 495af6e..a14b439 100644
--- a/clock.c
+++ b/clock.c
@@ -22,7 +22,7 @@
 
 	called from clock_10ms(), do not call directly
 */
-void clock_250ms() {
+static void clock_250ms() {
 	#ifndef	NO_AUTO_IDLE
 	if (temp_all_zero())	{
 		if (psu_timeout > (30 * 4)) {
@@ -67,7 +67,7 @@ void clock_250ms() {
 
 	called from clock(), do not call directly
 */
-void clock_10ms() {
+static void clock_10ms() {
 	// reset watchdog
 	wd_reset();
 
diff --git a/clock.h b/clock.h
index b2dd456..c0266b8 100644
--- a/clock.h
+++ b/clock.h
@@ -1,8 +1,6 @@
 #ifndef	_CLOCK_H
 #define	_CLOCK_H
 
-void clock_250ms(void);
-void clock_10ms(void);
 void clock(void);
 
 #endif	/* _CLOCK_H */