diff --git a/drivers/sensor/tdk/icm42688/icm42688.h b/drivers/sensor/tdk/icm42688/icm42688.h
index 5ca61a82cfa..410f0f983fb 100644
--- a/drivers/sensor/tdk/icm42688/icm42688.h
+++ b/drivers/sensor/tdk/icm42688/icm42688.h
@@ -506,7 +506,7 @@ static inline void icm42688_gyro_dps(const struct icm42688_cfg *cfg, int32_t in,
 static inline void icm42688_accel_ms(const struct icm42688_cfg *cfg, int32_t in, int32_t *out_ms,
 				     int32_t *out_ums)
 {
-	int64_t sensitivity = 0; /* value equivalent for 1g */
+	int64_t sensitivity;
 
 	switch (cfg->accel_fs) {
 	case ICM42688_DT_ACCEL_FS_2:
@@ -521,6 +521,8 @@ static inline void icm42688_accel_ms(const struct icm42688_cfg *cfg, int32_t in,
 	case ICM42688_DT_ACCEL_FS_16:
 		sensitivity = 2048;
 		break;
+	default:
+		CODE_UNREACHABLE;
 	}
 
 	/* Convert to micrometers/s^2 */
@@ -544,7 +546,7 @@ static inline void icm42688_accel_ms(const struct icm42688_cfg *cfg, int32_t in,
 static inline void icm42688_gyro_rads(const struct icm42688_cfg *cfg, int32_t in, int32_t *out_rads,
 				      int32_t *out_urads)
 {
-	int64_t sensitivity = 0; /* value equivalent for 10x gyro reading deg/s */
+	int64_t sensitivity;
 
 	switch (cfg->gyro_fs) {
 	case ICM42688_DT_GYRO_FS_2000:
@@ -571,6 +573,8 @@ static inline void icm42688_gyro_rads(const struct icm42688_cfg *cfg, int32_t in
 	case ICM42688_DT_GYRO_FS_15_625:
 		sensitivity = 20972;
 		break;
+	default:
+		CODE_UNREACHABLE;
 	}
 
 	int64_t in10_rads = (int64_t)in * SENSOR_PI * 10LL;