diff --git a/oeffi/build.gradle b/oeffi/build.gradle
index 0306973..a167570 100644
--- a/oeffi/build.gradle
+++ b/oeffi/build.gradle
@@ -80,6 +80,11 @@ android {
         }
     }
 
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
     packagingOptions {
         exclude 'META-INF/*.version'
         exclude 'META-INF/proguard/**'