diff --git a/src/main/java/com/nutomic/syncthingandroid/activities/MainActivity.java b/src/main/java/com/nutomic/syncthingandroid/activities/MainActivity.java
index bc7b1ebf..62aa677e 100644
--- a/src/main/java/com/nutomic/syncthingandroid/activities/MainActivity.java
+++ b/src/main/java/com/nutomic/syncthingandroid/activities/MainActivity.java
@@ -1,7 +1,6 @@
 package com.nutomic.syncthingandroid.activities;
 
 import android.annotation.SuppressLint;
-import android.annotation.TargetApi;
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.app.Dialog;
@@ -131,13 +130,13 @@ public class MainActivity extends SyncthingActivity
         }
     }
 
-    @TargetApi(23)
     private void showBatteryOptimizationDialogIfNecessary() {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M)
+            return;
         SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
         PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
         boolean dontShowAgain = sp.getBoolean("battery_optimization_dont_show_again", false);
         if (dontShowAgain || mBatteryOptimizationsDialog != null ||
-                Build.VERSION.SDK_INT < Build.VERSION_CODES.M ||
                 pm.isIgnoringBatteryOptimizations(getPackageName()) ||
                 mBatteryOptimizationDialogDismissed) {
             return;
diff --git a/src/main/java/com/nutomic/syncthingandroid/receiver/AppConfigReceiver.java b/src/main/java/com/nutomic/syncthingandroid/receiver/AppConfigReceiver.java
index 12315eaf..81e1311c 100644
--- a/src/main/java/com/nutomic/syncthingandroid/receiver/AppConfigReceiver.java
+++ b/src/main/java/com/nutomic/syncthingandroid/receiver/AppConfigReceiver.java
@@ -1,6 +1,5 @@
 package com.nutomic.syncthingandroid.receiver;
 
-import android.annotation.TargetApi;
 import android.app.Notification;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
@@ -35,7 +34,6 @@ public class AppConfigReceiver extends BroadcastReceiver {
     public static final String ACTION_STOP  = "com.nutomic.syncthingandroid.action.STOP";
 
     @Override
-    @TargetApi(21)
     public void onReceive(Context context, Intent intent) {
         switch (intent.getAction()) {
             case ACTION_START:
diff --git a/src/main/java/com/nutomic/syncthingandroid/service/DeviceStateHolder.java b/src/main/java/com/nutomic/syncthingandroid/service/DeviceStateHolder.java
index 913278c4..81b791a8 100644
--- a/src/main/java/com/nutomic/syncthingandroid/service/DeviceStateHolder.java
+++ b/src/main/java/com/nutomic/syncthingandroid/service/DeviceStateHolder.java
@@ -1,6 +1,5 @@
 package com.nutomic.syncthingandroid.service;
 
-import android.annotation.TargetApi;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
@@ -49,7 +48,6 @@ public class DeviceStateHolder extends BroadcastReceiver {
 
     private boolean mIsCharging = false;
 
-    @TargetApi(16)
     public DeviceStateHolder(Context context) {
         mContext = context;
         ConnectivityManager cm = (ConnectivityManager)
@@ -111,7 +109,6 @@ public class DeviceStateHolder extends BroadcastReceiver {
     /**
      * Determines if Syncthing should currently run.
      */
-    @TargetApi(21)
     public boolean shouldRun() {
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(mContext);
         PowerManager pm = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);
diff --git a/src/main/java/com/nutomic/syncthingandroid/service/SyncthingService.java b/src/main/java/com/nutomic/syncthingandroid/service/SyncthingService.java
index 5952030c..c36d6fe4 100644
--- a/src/main/java/com/nutomic/syncthingandroid/service/SyncthingService.java
+++ b/src/main/java/com/nutomic/syncthingandroid/service/SyncthingService.java
@@ -1,6 +1,5 @@
 package com.nutomic.syncthingandroid.service;
 
-import android.annotation.TargetApi;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.app.Service;
@@ -305,7 +304,6 @@ public class SyncthingService extends Service implements
      * Starts the native binary.
      */
     @Override
-    @TargetApi(21)
     public void onCreate() {
         super.onCreate();
         PRNGFixes.apply();