diff --git a/build.xml b/build.xml
index 18dd29ba693..f469be79d39 100644
--- a/build.xml
+++ b/build.xml
@@ -558,6 +558,8 @@
                 <pathelement path="build-common/test"/>
                 <pathelement path="compiler/incremental-compilation-impl/test"/>
             </src>
+            <exclude name="**/*Generated.java"/>
+
             <classpath>
                 <pathelement path="${bootstrap.runtime}"/>
                 <pathelement path="${bootstrap.reflect}"/>