diff --git a/build.gradle b/build.gradle
index 427cc61..f174b65 100644
--- a/build.gradle
+++ b/build.gradle
@@ -31,6 +31,8 @@ apply plugin: 'maven'
 apply plugin: 'groovy'
 
 group 'org.scoverage'
+sourceCompatibility = '1.6'
+targetCompatibility = '1.6'
 
 configurations {
     scoverage