diff --git a/tools/cooja/apps/mrm/build.xml b/tools/cooja/apps/mrm/build.xml
index 76e069e33..eabf1e95b 100644
--- a/tools/cooja/apps/mrm/build.xml
+++ b/tools/cooja/apps/mrm/build.xml
@@ -26,7 +26,6 @@
 
   <target name="jar" depends="clean, init, compile">
     <jar destfile="${lib}/mrm.jar" basedir="${build}">
-      <fileset dir="${build}"/>
       <fileset dir="images"/>
       <manifest>
         <attribute name="Class-Path" value="."/>
diff --git a/tools/cooja/apps/mspsim/build.xml b/tools/cooja/apps/mspsim/build.xml
index 7ce988f21..69a1d7f8d 100644
--- a/tools/cooja/apps/mspsim/build.xml
+++ b/tools/cooja/apps/mspsim/build.xml
@@ -44,7 +44,6 @@
 
   <target name="jar" depends="clean, init, compile">
     <jar destfile="${cooja_mspsim_jar}" basedir="${build}">
-      <fileset dir="${build}"/>
       <manifest>
         <attribute name="Class-Path" value="."/>
       </manifest>
diff --git a/tools/cooja/apps/serial2pipe/build.xml b/tools/cooja/apps/serial2pipe/build.xml
index d75667b75..4e8a9647e 100644
--- a/tools/cooja/apps/serial2pipe/build.xml
+++ b/tools/cooja/apps/serial2pipe/build.xml
@@ -26,7 +26,6 @@
 
   <target name="jar" depends="clean, init, compile">
     <jar destfile="${lib}/serial2pipe.jar" basedir="${build}">
-      <fileset dir="${build}"/>
       <manifest>
         <attribute name="Class-Path" value="."/>
       </manifest>