diff --git a/src/etc/testcases/taskdefs/optional/antlr/antlr.xml b/src/etc/testcases/taskdefs/optional/antlr/antlr.xml
index d4752ee07..2b1fc61a5 100644
--- a/src/etc/testcases/taskdefs/optional/antlr/antlr.xml
+++ b/src/etc/testcases/taskdefs/optional/antlr/antlr.xml
@@ -25,6 +25,7 @@
   </target>
 
   <target name="test5">
+    <mkdir dir="${tmp.dir}"/>
     <antlr target="java.tree.g" outputdirectory="${tmp.dir}" fork="yes"/>
   </target>