diff --git a/geronimo-specs.build.xml b/geronimo-specs.build.xml
index a524288..574fac3 100644
--- a/geronimo-specs.build.xml
+++ b/geronimo-specs.build.xml
@@ -204,7 +204,7 @@
       <mkdir dir="${gbuild.dir}/${dist}"/>
       <mkdir dir="${gbuild.dir}/${apidocs}"/>
 
-      <javac srcdir="${gbuild.dir}/${src}" destdir="${gbuild.dir}/${build}" classpath="${gbuild.classpath}" encoding="UTF-8"/>
+      <javac source="1.8" target="1.8" srcdir="${gbuild.dir}/${src}" destdir="${gbuild.dir}/${build}" classpath="${gbuild.classpath}" encoding="UTF-8"/>
 
       <jar jarfile="${gbuild.dir}/${dist}/${gbuild.jar}" basedir="${gbuild.dir}/${build}"/>