10 files changed, 16 insertions, 16 deletions
diff --git a/keyboards/preonic/keymaps/0xdec/keymap.c b/keyboards/preonic/keymaps/0xdec/keymap.c
index 4cf3a21049..fafa5c4460 100644
--- a/keyboards/preonic/keymaps/0xdec/keymap.c
+++ b/keyboards/preonic/keymaps/0xdec/keymap.c
@@ -98,11 +98,11 @@ float tone_game[][2]    = {
 float tone_goodbye[][2] = SONG(GOODBYE_SOUND);
 float music_scale[][2]  = SONG(MUSIC_SCALE_SOUND);
 
-void startup_user() {
+void startup_user(void) {
   _delay_ms(20); // gets rid of tick
   PLAY_SONG(tone_startup);
 }
-void shutdown_user() {
+void shutdown_user(void) {
   PLAY_SONG(tone_goodbye);
   _delay_ms(150);
   stop_all_notes();
diff --git a/keyboards/preonic/keymaps/bucktooth/keymap.c b/keyboards/preonic/keymaps/bucktooth/keymap.c
index b68a93ba3c..593083f201 100644
--- a/keyboards/preonic/keymaps/bucktooth/keymap.c
+++ b/keyboards/preonic/keymaps/bucktooth/keymap.c
@@ -91,12 +91,12 @@ void matrix_init_user(void) {
 
 #ifdef AUDIO_ENABLE
 
-void startup_user()
+void startup_user(void)
 {
     PLAY_SONG(tone_startup);
 }
 
-void shutdown_user()
+void shutdown_user(void)
 {
     PLAY_SONG(tone_goodbye);
     stop_all_notes();
diff --git a/keyboards/preonic/keymaps/jacwib/keymap.c b/keyboards/preonic/keymaps/jacwib/keymap.c
index 774b2a0c4e..9de460c2a4 100644
--- a/keyboards/preonic/keymaps/jacwib/keymap.c
+++ b/keyboards/preonic/keymaps/jacwib/keymap.c
@@ -258,13 +258,13 @@ void matrix_init_user(void) {
 
 #ifdef AUDIO_ENABLE
 
-void startup_user()
+void startup_user(void)
 {
     _delay_ms(20); // gets rid of tick
     PLAY_SONG(tone_startup);
 }
 
-void shutdown_user()
+void shutdown_user(void)
 {
     PLAY_SONG(tone_goodbye);
     _delay_ms(150);
diff --git a/keyboards/preonic/keymaps/mverteuil/keymap.c b/keyboards/preonic/keymaps/mverteuil/keymap.c
index 332e2877b2..e81f38362a 100644
--- a/keyboards/preonic/keymaps/mverteuil/keymap.c
+++ b/keyboards/preonic/keymaps/mverteuil/keymap.c
@@ -242,7 +242,7 @@ float s_audio_on[][2]    = AUDIO_ON_SONG;
 float s_layer_lower[][2] = LAYER_LOWER_SONG;
 float s_layer_raise[][2] = LAYER_RAISE_SONG;
 
-void audio_on_user() { PLAY_SONG(s_audio_on); };
+void audio_on_user(void) { PLAY_SONG(s_audio_on); };
 
 bool process_record_user(uint16_t keycode, keyrecord_t *record) {
     switch (keycode) {
diff --git a/keyboards/preonic/keymaps/mverteuil_2x2u/keymap.c b/keyboards/preonic/keymaps/mverteuil_2x2u/keymap.c
index c6cad0fe5f..cab5cdcb05 100644
--- a/keyboards/preonic/keymaps/mverteuil_2x2u/keymap.c
+++ b/keyboards/preonic/keymaps/mverteuil_2x2u/keymap.c
@@ -218,7 +218,7 @@ float s_audio_on[][2]    = AUDIO_ON_SONG;
 float s_layer_lower[][2] = LAYER_LOWER_SONG;
 float s_layer_raise[][2] = LAYER_RAISE_SONG;
 
-void audio_on_user() { PLAY_SONG(s_audio_on); };
+void audio_on_user(void) { PLAY_SONG(s_audio_on); };
 
 bool process_record_user(uint16_t keycode, keyrecord_t *record) {
     switch (keycode) {
diff --git a/keyboards/preonic/keymaps/nikchi/keymap.c b/keyboards/preonic/keymaps/nikchi/keymap.c
index 9510791d2a..e14f8f0052 100644
--- a/keyboards/preonic/keymaps/nikchi/keymap.c
+++ b/keyboards/preonic/keymaps/nikchi/keymap.c
@@ -186,13 +186,13 @@ void matrix_init_user(void) {
 
 #ifdef AUDIO_ENABLE
 
-void startup_user()
+void startup_user(void)
 {
     _delay_ms(20); // gets rid of tick
     PLAY_SONG(tone_startup);
 }
 
-void shutdown_user()
+void shutdown_user(void)
 {
     PLAY_SONG(tone_goodbye);
     _delay_ms(150);
diff --git a/keyboards/preonic/keymaps/smt/keymap.c b/keyboards/preonic/keymaps/smt/keymap.c
index 80c704de32..7dd9545261 100644
--- a/keyboards/preonic/keymaps/smt/keymap.c
+++ b/keyboards/preonic/keymaps/smt/keymap.c
@@ -251,13 +251,13 @@ void matrix_init_user(void) {
 
 #ifdef AUDIO_ENABLE
 
-void startup_user()
+void startup_user(void)
 {
     _delay_ms(20); // gets rid of tick
     PLAY_SONG(tone_startup);
 }
 
-void shutdown_user()
+void shutdown_user(void)
 {
     PLAY_SONG(tone_goodbye);
     _delay_ms(150);
diff --git a/keyboards/preonic/keymaps/that_canadian/keymap.c b/keyboards/preonic/keymaps/that_canadian/keymap.c
index 0c2a05fa14..8af796821c 100644
--- a/keyboards/preonic/keymaps/that_canadian/keymap.c
+++ b/keyboards/preonic/keymaps/that_canadian/keymap.c
@@ -210,13 +210,13 @@ void matrix_init_user(void) {
 
 #ifdef AUDIO_ENABLE
 
-void startup_user()
+void startup_user(void)
 {
     _delay_ms(20); // gets rid of tick
     PLAY_SONG(tone_startup);
 }
 
-void shutdown_user()
+void shutdown_user(void)
 {
     PLAY_SONG(tone_goodbye);
     _delay_ms(150);
diff --git a/keyboards/preonic/keymaps/trigotometry/keymap.c b/keyboards/preonic/keymaps/trigotometry/keymap.c
index aa734328b5..419f7a10ba 100644
--- a/keyboards/preonic/keymaps/trigotometry/keymap.c
+++ b/keyboards/preonic/keymaps/trigotometry/keymap.c
@@ -157,7 +157,7 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
 //   {NOTE_E5, 8}
 // };
 
-// void startup_user()
+// void startup_user(void)
 // {
 //     _delay_ms(20); // gets rid of tick
 //     PLAY_SONG(tone_startup);
diff --git a/keyboards/preonic/keymaps/zach/zach_common_functions.c b/keyboards/preonic/keymaps/zach/zach_common_functions.c
index 97b650d9cb..6ad1c7bed3 100644
--- a/keyboards/preonic/keymaps/zach/zach_common_functions.c
+++ b/keyboards/preonic/keymaps/zach/zach_common_functions.c
@@ -427,7 +427,7 @@ void play_goodbye_tone(void){
   _delay_ms(150);
 }
 
-void shutdown_user(){
+void shutdown_user(void){
     PLAY_SONG(tone_goodbye);
     _delay_ms(150);
     stop_all_notes();