diff --git a/src/script/ant b/src/script/ant
index fa75fc3d9..b032dd983 100644
--- a/src/script/ant
+++ b/src/script/ant
@@ -151,7 +151,7 @@ if [ -n "$JAVA_HOME" ] ; then
     fi
   fi
 else
-  echo "Warning: JAVA_HOME environment variable is not set."
+  echo "Warning: JAVA_HOME environment variable is not set (or not exported)."
   echo "  If build fails because sun.* classes could not be found"
   echo "  you will need to set the JAVA_HOME environment variable"
   echo "  to the installation directory of java."