diff --git a/app/build.gradle b/app/build.gradle
index dcdc872..cad76d2 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -7,8 +7,8 @@ android {
     defaultConfig {
         minSdkVersion 3
         targetSdkVersion 23
-        versionCode 26
-        versionName '3.6'
+        versionCode 27
+        versionName '3.7'
     }
 
     signingConfigs {
diff --git a/app/src/main/java/org/traccar/client/TrackingController.java b/app/src/main/java/org/traccar/client/TrackingController.java
index 422b626..cb6d9bb 100644
--- a/app/src/main/java/org/traccar/client/TrackingController.java
+++ b/app/src/main/java/org/traccar/client/TrackingController.java
@@ -17,6 +17,7 @@ package org.traccar.client;
 
 import android.content.Context;
 import android.content.SharedPreferences;
+import android.os.Build;
 import android.os.Handler;
 import android.os.PowerManager;
 import android.preference.PreferenceManager;
@@ -44,7 +45,11 @@ public class TrackingController implements PositionProvider.PositionListener, Ne
     private PowerManager.WakeLock wakeLock;
 
     private void lock() {
-        wakeLock.acquire(WAKE_LOCK_TIMEOUT);
+        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.GINGERBREAD_MR1) {
+            wakeLock.acquire();
+        } else {
+            wakeLock.acquire(WAKE_LOCK_TIMEOUT);
+        }
     }
 
     private void unlock() {