diff --git a/app/src/main/java/no/nordicsemi/android/nrftoolbox/profile/BleProfileService.java b/app/src/main/java/no/nordicsemi/android/nrftoolbox/profile/BleProfileService.java
index 14364974..7fd3f2f1 100644
--- a/app/src/main/java/no/nordicsemi/android/nrftoolbox/profile/BleProfileService.java
+++ b/app/src/main/java/no/nordicsemi/android/nrftoolbox/profile/BleProfileService.java
@@ -34,6 +34,7 @@ import android.net.Uri;
 import android.os.Binder;
 import android.os.Handler;
 import android.os.IBinder;
+import android.support.annotation.NonNull;
 import android.support.annotation.StringRes;
 import android.support.v4.content.LocalBroadcastManager;
 import android.widget.Toast;
@@ -204,7 +205,7 @@ public abstract class BleProfileService extends Service implements BleManagerCal
 		}
 
 		@Override
-		public void log(final int level, final String message) {
+		public void log(final int level, @NonNull final String message) {
 			Logger.log(mLogSession, level, message);
 		}
 
diff --git a/app/src/main/java/no/nordicsemi/android/nrftoolbox/profile/multiconnect/BleMulticonnectProfileService.java b/app/src/main/java/no/nordicsemi/android/nrftoolbox/profile/multiconnect/BleMulticonnectProfileService.java
index 6dfe0880..fcedc791 100644
--- a/app/src/main/java/no/nordicsemi/android/nrftoolbox/profile/multiconnect/BleMulticonnectProfileService.java
+++ b/app/src/main/java/no/nordicsemi/android/nrftoolbox/profile/multiconnect/BleMulticonnectProfileService.java
@@ -32,6 +32,7 @@ import android.content.IntentFilter;
 import android.os.Binder;
 import android.os.Handler;
 import android.os.IBinder;
+import android.support.annotation.NonNull;
 import android.support.annotation.StringRes;
 import android.support.v4.content.LocalBroadcastManager;
 import android.widget.Toast;
@@ -219,7 +220,7 @@ public abstract class BleMulticonnectProfileService extends Service implements B
 		}
 
 		@Override
-		public void log(final int level, final String message) {
+		public void log(final int level, @NonNull final String message) {
 			for (final BleManager<BleManagerCallbacks> manager : mBleManagers.values())
 				manager.log(level, message);
 		}