diff --git a/build.xml b/build.xml
index dcbbdc0..44a6c39 100644
--- a/build.xml
+++ b/build.xml
@@ -100,7 +100,7 @@
   <target name="compile" depends="prepare,compute-builds"
           description="Compiles the code.">
     <javac srcdir="${src.dir}" destdir="${classes.dir}" includeAntRuntime="false"
-           debug="on" optimize="${build.optimize}" source="1.6" target="1.5" encoding="utf-8">
+           debug="on" optimize="${build.optimize}" source="1.5" target="1.5" encoding="utf-8">
       <classpath refid="classpath"/>
       <exclude name="com/samskivert/depot/OldEHCacheAdapter.java" unless="build.ehcache"/>
       <exclude name="com/samskivert/depot/EHCacheAdapter.java" unless="build.ehcache"/>