diff --git a/pom.xml b/pom.xml
index c29e1c7..62993ca 100644
--- a/pom.xml
+++ b/pom.xml
@@ -54,7 +54,7 @@
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 		<!-- GWT needs at least java 1.6 -->
-		<maven.compiler.source>1.8</maven.compiler.source>
+		<maven.compiler.source>1.7</maven.compiler.source>
 		<maven.compiler.target>1.8</maven.compiler.target>
 	</properties>
 	<dependencies>