diff --git a/app/src/activity.c b/app/src/activity.c
index 1e93bfb6..f713dde5 100644
--- a/app/src/activity.c
+++ b/app/src/activity.c
@@ -80,11 +80,11 @@ void activity_work_handler(struct k_work *work) {
 
 K_WORK_DEFINE(activity_work, activity_work_handler);
 
-void activity_expiry_function(void) { k_work_submit(&activity_work); }
+void activity_expiry_function(struct k_timer *_timer) { k_work_submit(&activity_work); }
 
 K_TIMER_DEFINE(activity_timer, activity_expiry_function, NULL);
 
-int activity_init(void) {
+int activity_init(const struct device *_device) {
     activity_last_uptime = k_uptime_get();
 
     k_timer_start(&activity_timer, K_SECONDS(1), K_SECONDS(1));
diff --git a/app/src/rgb_underglow.c b/app/src/rgb_underglow.c
index dabe0bbb..ddc0aef1 100644
--- a/app/src/rgb_underglow.c
+++ b/app/src/rgb_underglow.c
@@ -232,7 +232,7 @@ static int rgb_settings_set(const char *name, size_t len, settings_read_cb read_
 
 struct settings_handler rgb_conf = {.name = "rgb/underglow", .h_set = rgb_settings_set};
 
-static void zmk_rgb_underglow_save_state_work(void) {
+static void zmk_rgb_underglow_save_state_work(struct k_work *_work) {
     settings_save_one("rgb/underglow/state", &state, sizeof(state));
 }
 
diff --git a/app/src/workqueue.c b/app/src/workqueue.c
index e6e55c87..1aa4f59a 100644
--- a/app/src/workqueue.c
+++ b/app/src/workqueue.c
@@ -17,7 +17,7 @@ struct k_work_q *zmk_workqueue_lowprio_work_q(void) {
     return &lowprio_work_q;
 }
 
-static int workqueue_init(void) {
+static int workqueue_init(const struct device *_device) {
     static const struct k_work_queue_config queue_config = {.name = "Low Priority Work Queue"};
     k_work_queue_start(&lowprio_work_q, lowprio_q_stack, K_THREAD_STACK_SIZEOF(lowprio_q_stack),
                        CONFIG_ZMK_LOW_PRIORITY_THREAD_PRIORITY, &queue_config);