diff --git a/java/build.xml b/java/build.xml
index 81d8d6f1e..45b6abb70 100644
--- a/java/build.xml
+++ b/java/build.xml
@@ -118,6 +118,7 @@
   </target>
 
   <target name="build-carrier-data">
+    <delete dir="carrier/src/com/google/i18n/phonenumbers/carrier/data"/>
     <exec executable="java">
       <arg value="-jar" />
       <arg value="${build.tools.jar}"/>
@@ -128,6 +129,7 @@
   </target>
 
   <target name="build-carrier-test-data">
+    <delete dir="carrier/test/com/google/i18n/phonenumbers/carrier/testing_data"/>
     <exec executable="java">
       <arg value="-jar" />
       <arg value="${build.tools.jar}"/>
@@ -138,6 +140,7 @@
   </target>
 
   <target name="build-geo-data">
+    <delete dir="geocoder/src/com/google/i18n/phonenumbers/geocoding/data"/>
     <exec executable="java">
       <arg value="-jar" />
       <arg value="${build.tools.jar}"/>
@@ -148,6 +151,7 @@
   </target>
 
   <target name="build-geo-test-data">
+    <delete dir="geocoder/test/com/google/i18n/phonenumbers/geocoding/testing_data"/>
     <exec executable="java">
       <arg value="-jar" />
       <arg value="${build.tools.jar}"/>