diff --git a/oeffi/AndroidManifest.xml b/oeffi/AndroidManifest.xml
index c718d95..27bb733 100644
--- a/oeffi/AndroidManifest.xml
+++ b/oeffi/AndroidManifest.xml
@@ -24,7 +24,7 @@
 
     <uses-sdk
         android:minSdkVersion="16"
-        android:targetSdkVersion="28" />
+        android:targetSdkVersion="27" />
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
diff --git a/oeffi/build.gradle b/oeffi/build.gradle
index 17e0ae3..374cbf2 100644
--- a/oeffi/build.gradle
+++ b/oeffi/build.gradle
@@ -26,7 +26,7 @@ dependencies {
 }
 
 android {
-    compileSdkVersion 'android-28'
+    compileSdkVersion 'android-27'
     buildToolsVersion '28.0.3'
 
     lintOptions {
diff --git a/oeffi/project.properties b/oeffi/project.properties
index 64784a8..7c0f563 100644
--- a/oeffi/project.properties
+++ b/oeffi/project.properties
@@ -10,4 +10,4 @@
 # Indicates whether an apk should be generated for each density.
 split.density=false
 # Project target.
-target=android-28
+target=android-27