diff --git a/pin_control/include/pin_control.h b/pin_control/include/pin_control.h
index bcf2dc7..0ca9250 100644
--- a/pin_control/include/pin_control.h
+++ b/pin_control/include/pin_control.h
@@ -5,10 +5,6 @@ int init_gpio();
 
 void cleanup_gpio();
 
-int set_pin_state(int pin, int state);
-
-int read_button(int pin);
-
 int turn_on_pin(int pin);
 
 int turn_off_pin(int pin);
diff --git a/pin_control/src/pin_control.c b/pin_control/src/pin_control.c
index aa2b386..e583bd9 100644
--- a/pin_control/src/pin_control.c
+++ b/pin_control/src/pin_control.c
@@ -22,7 +22,7 @@ void cleanup_gpio() {
     gpiod_chip_close(chip);
 }
 
-int set_pin_state(int pin, int state) {
+static int set_pin_state(int pin, int state) {
     // https://libgpiod-dlang.dpldocs.info/gpiod.gpiod_chip_get_line.html
     struct gpiod_line *line = gpiod_chip_get_line(chip, pin);   // this may need an offset
     if (!line) {
@@ -73,7 +73,7 @@ int turn_off_all_pins() {
     return 0;
 }
 
-int button_presssed(int event, unsigned int pin, const struct timespec * timestamp, void *data) {
+static int button_presssed(int event, unsigned int pin, const struct timespec * timestamp, void *data) {
     (void) event;
     (void) timestamp;
     * (int *) data = (int) pin;