diff --git a/app/src/main/java/me/lucky/wasted/AppNotificationManager.kt b/app/src/main/java/me/lucky/wasted/AppNotificationManager.kt
index f3330af..006c14b 100644
--- a/app/src/main/java/me/lucky/wasted/AppNotificationManager.kt
+++ b/app/src/main/java/me/lucky/wasted/AppNotificationManager.kt
@@ -13,7 +13,7 @@ class AppNotificationManager(private val ctx: Context) {
     private var manager: NotificationManager? = null
 
     init {
-        manager = ctx.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager?
+        manager = ctx.getSystemService(NotificationManager::class.java)
     }
 
     fun createNotificationChannels() {
@@ -26,4 +26,4 @@ class AppNotificationManager(private val ctx: Context) {
             )
         )
     }
-}
\ No newline at end of file
+}
diff --git a/app/src/main/java/me/lucky/wasted/DeviceAdminManager.kt b/app/src/main/java/me/lucky/wasted/DeviceAdminManager.kt
index 4ab6f7f..8d8910f 100644
--- a/app/src/main/java/me/lucky/wasted/DeviceAdminManager.kt
+++ b/app/src/main/java/me/lucky/wasted/DeviceAdminManager.kt
@@ -12,7 +12,7 @@ class DeviceAdminManager(private val ctx: Context) {
     private val prefs by lazy { Preferences(ctx) }
 
     init {
-        dpm = ctx.getSystemService(Context.DEVICE_POLICY_SERVICE) as DevicePolicyManager?
+        dpm = ctx.getSystemService(DevicePolicyManager::class.java)
     }
 
     fun remove() = dpm?.removeActiveAdmin(deviceAdmin)
diff --git a/app/src/main/java/me/lucky/wasted/UnlockService.kt b/app/src/main/java/me/lucky/wasted/UnlockService.kt
index 91673b1..3e8f3ba 100644
--- a/app/src/main/java/me/lucky/wasted/UnlockService.kt
+++ b/app/src/main/java/me/lucky/wasted/UnlockService.kt
@@ -21,9 +21,7 @@ class UnlockService : Service() {
     private class UnlockReceiver : BroadcastReceiver() {
         override fun onReceive(context: Context?, intent: Intent?) {
             if (context == null) return
-            val keyguardManager = context
-                .getSystemService(Context.KEYGUARD_SERVICE) as KeyguardManager?
-            if (keyguardManager?.isDeviceSecure != true) return
+            if (context.getSystemService(KeyguardManager::class.java)?.isDeviceSecure != true) return
             val manager = WipeJobManager(context)
             var delay = 1000L
             while (manager.schedule() != JobScheduler.RESULT_SUCCESS) {
diff --git a/app/src/main/java/me/lucky/wasted/WipeJobManager.kt b/app/src/main/java/me/lucky/wasted/WipeJobManager.kt
index 1f7732c..0067246 100644
--- a/app/src/main/java/me/lucky/wasted/WipeJobManager.kt
+++ b/app/src/main/java/me/lucky/wasted/WipeJobManager.kt
@@ -14,7 +14,7 @@ class WipeJobManager(private val ctx: Context) {
     private var scheduler: JobScheduler? = null
 
     init {
-        scheduler = ctx.getSystemService(Context.JOB_SCHEDULER_SERVICE) as JobScheduler?
+        scheduler = ctx.getSystemService(JobScheduler::class.java)
     }
 
     fun schedule(): Int {