diff --git a/build.gradle b/build.gradle
index c3cc8f8efd79c9b297b2e3144860f86904a9f0a1..04fab62e14d7faa65cbf0dacd417d3a3ce997dcb 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,10 @@ apply plugin: 'maven'
 
 project.version = '3.2.8'
 project.group = 'de.stups'
-sourceCompatibility = 1.5
+allprojects {
+    sourceCompatibility = 1.5
+    targetCompatibility = 1.5
+}
 
 repositories {
     maven {