diff --git a/tools/cooja/apps/mspsim/build.xml b/tools/cooja/apps/mspsim/build.xml
index 89cd83793..7ce988f21 100644
--- a/tools/cooja/apps/mspsim/build.xml
+++ b/tools/cooja/apps/mspsim/build.xml
@@ -4,7 +4,7 @@
   <property name="src" location="src"/>
   <property name="build" location="build"/>
   <property name="lib" location="lib"/>
-
+  <property name="javadoc" location="javadoc"/>
 	<property name="cooja" location="../.."/>
   
 	<property name="cooja_jar" value="${cooja}/dist/cooja.jar"/>