diff --git a/build/build.xml b/build/build.xml
index c2a572d73..f9dac9239 100644
--- a/build/build.xml
+++ b/build/build.xml
@@ -99,6 +99,7 @@
             destdir="${compile.test.dir}"
             includeAntRuntime="no"
             debug="on"
+            source="1.3"
         >
             <src path="${basedir}/test" />
             <classpath>