diff --git a/maybe/build.gradle b/maybe/build.gradle
index e277b3f..937efa3 100644
--- a/maybe/build.gradle
+++ b/maybe/build.gradle
@@ -1,10 +1,17 @@
 apply plugin: 'java'
 apply plugin: 'checkstyle'
 
+version = '0.0'
+
 dependencies {
   testCompile 'junit:junit:4.12'
 }
 
 checkstyle {
-    configFile file('../config/checkstyle/checkstyle.xml')
+  configFile file('../config/checkstyle/checkstyle.xml')
+}
+
+compileJava {
+  sourceCompatibility = 1.7
+  targetCompatibility = 1.7
 }
\ No newline at end of file