diff --git a/mobile/build/windows/build.xml b/mobile/build/windows/build.xml
index f9f18e75a..982f77492 100755
--- a/mobile/build/windows/build.xml
+++ b/mobile/build/windows/build.xml
@@ -22,11 +22,18 @@
         <property name="wtk.dir" value="C:/WTK22"/>
         <!-- the boot classpath to use when compiling core files -->
         <property name="wtk.bootClassPath" value="${wtk.dir}/lib/cldcapi10.jar;${wtk.dir}/lib/midpapi10.jar"/>
+        <!-- the tag to use when checking out processing -->
+        <property name="cvs.tag.processing" value="processing-0074"/>
     </target>
        
-    <!-- checks out a recent tagged copy of processing (tag currently hard coded here
-         for now) if it hasn't been done so already. -->
+    <!-- checks out a tagged copy of processing if it hasn't been done so already. -->
     <target name="checkout" unless="ischeckedout">
+        <!-- perform the cvs update to get clean files. -->
+        <exec executable="${cygwin.dir}/bin/bash.exe">
+            <arg value="--login"/>
+            <arg value="-c"/>
+            <arg value="cd ${parent.dir}; cvs -z3 -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/processing co -r ${cvs.tag.processing} -P processing"/>
+        </exec>
     </target>
     
     <!-- gets unmodified tagged source files back into the processing app directory. -->