diff --git a/pom.xml b/pom.xml
index 84bbfc6..5942816 100644
--- a/pom.xml
+++ b/pom.xml
@@ -47,6 +47,8 @@
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
+		<!-- Java -->
+		<maven.compiler.source>1.7</maven.compiler.source>
 
 		<!-- GWT configuration -->
 		<gwtVersion>2.6.1</gwtVersion>