diff --git a/configure.ac b/configure.ac
index 4a88cd8..8951750 100644
--- a/configure.ac
+++ b/configure.ac
@@ -77,6 +77,7 @@
   if test "x$have_log4j" = "xyes" && test "x$have_hashcode" = "xyes" ; then
     ANT_FLAGS="$ANT_FLAGS -Dnoivy="
   fi
+  AC_SUBST(CLASSPATH)
   AC_SUBST(ANT_FLAGS)
 fi
 AM_CONDITIONAL([WITH_JAVA],
diff --git a/lib/java/Makefile.am b/lib/java/Makefile.am
index ffcdc03..c5c7521 100644
--- a/lib/java/Makefile.am
+++ b/lib/java/Makefile.am
@@ -19,6 +19,8 @@
 
 EXTRA_DIST = build.xml src test
 
+export CLASSPATH
+
 all-local:
 	$(ANT) $(ANT_FLAGS)