diff --git a/app/build.gradle b/app/build.gradle
index 0e1cdd07..da77da48 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -11,12 +11,12 @@ android {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
-    compileSdkVersion 28
+    compileSdkVersion 27
     dataBinding.enabled true
     defaultConfig {
         applicationId 'com.wireguard.android'
         minSdkVersion 21
-        targetSdkVersion 28
+        targetSdkVersion 27
         versionCode 437
         versionName '0.0.20180725'
         buildConfigField 'int', 'MIN_SDK_VERSION', "$minSdkVersion.apiLevel"
diff --git a/app/src/main/java/com/wireguard/android/QuickTileService.java b/app/src/main/java/com/wireguard/android/QuickTileService.java
index 15b06670..55d3528f 100644
--- a/app/src/main/java/com/wireguard/android/QuickTileService.java
+++ b/app/src/main/java/com/wireguard/android/QuickTileService.java
@@ -58,10 +58,13 @@ public class QuickTileService extends TileService {
         return ret;
     }
 
+    /* TODO: for Android P: Build.VERSION_CODES.P */
+    private static final int BUILD_VERSION_CODES_P = 28;
+
     @SuppressWarnings("deprecation")
     @Override
     public void onCreate() {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
+        if (Build.VERSION.SDK_INT >= BUILD_VERSION_CODES_P) {
             iconOff = iconOn = Icon.createWithResource(this, R.drawable.ic_tile);
             return;
         }