diff --git a/build.xml b/build.xml
index 8a9e0ed96..884a8cd8c 100644
--- a/build.xml
+++ b/build.xml
@@ -15,9 +15,7 @@
         <get src="http://antlr.org/download/${antlr3.jar.name}" dest="${antlr3.jar}" skipexisting="true"/>
         <path id="cp.antlr3" path="${antlr3.jar}"/>
 
-        <!-- Create the build directory structure used by compile -->
         <property name="build.antlr3.dir" value="${build.dir}/generated-sources/antlr3" />
-        <mkdir dir="${build.antlr3.dir}" />
     </target>
 
     <target name="build-init" depends="basic-init">
@@ -37,6 +35,8 @@
     </target>
 
 	<target name="antlr3" depends="build-init,antlr3-init">
+        <mkdir dir="${build.antlr3.dir}" />
+
 		<echo>parse grammars</echo>
 		<java classname="org.antlr.Tool" fork="true" failonerror="true" maxmemory="300m"
 			dir="${basedir}/tool/src/org/antlr/v4/parse">