diff --git a/ant-antunit.spec b/ant-antunit.spec
index aa58ad5..358eed5 100644
--- a/ant-antunit.spec
+++ b/ant-antunit.spec
@@ -55,6 +55,7 @@ touch -r CONTRIBUTORS.orig CONTRIBUTORS
 
 
 %build
+export CLASSPATH=`build-classpath junit4`
 ant package