diff --git a/drivers/counter/counter_ll_stm32_timer.c b/drivers/counter/counter_ll_stm32_timer.c
index 629c0f3..65146bd 100644
--- a/drivers/counter/counter_ll_stm32_timer.c
+++ b/drivers/counter/counter_ll_stm32_timer.c
@@ -339,10 +339,13 @@
 	switch (counter_get_num_of_channels(dev)) {
 	case 4U:
 		pending |= LL_TIM_IsActiveFlag_CC4(cfg->timer);
+		__fallthrough;
 	case 3U:
 		pending |= LL_TIM_IsActiveFlag_CC3(cfg->timer);
+		__fallthrough;
 	case 2U:
 		pending |= LL_TIM_IsActiveFlag_CC2(cfg->timer);
+		__fallthrough;
 	case 1U:
 		pending |= LL_TIM_IsActiveFlag_CC1(cfg->timer);
 	}
@@ -585,10 +588,13 @@
 	switch (counter_get_num_of_channels(dev)) {
 	case 4U:
 		TIM_IRQ_HANDLE_CC(timer, 4);
+		__fallthrough;
 	case 3U:
 		TIM_IRQ_HANDLE_CC(timer, 3);
+		__fallthrough;
 	case 2U:
 		TIM_IRQ_HANDLE_CC(timer, 2);
+		__fallthrough;
 	case 1U:
 		TIM_IRQ_HANDLE_CC(timer, 1);
 	}