diff --git a/build.xml b/build.xml
index 4155acb..b50c524 100644
--- a/build.xml
+++ b/build.xml
@@ -29,6 +29,7 @@
            debug="${javac.debug}" includeantruntime="false">
       <compilerarg value="-Xlint:unchecked"/>
       <compilerarg value="-deprecation"/>
+      <exclude name="tests/**" />
     </javac>
   </target>