diff --git a/tools/cooja/apps/native_gateway/build.xml b/tools/cooja/apps/native_gateway/build.xml
index 56f12f3ae..ce1865e18 100644
--- a/tools/cooja/apps/native_gateway/build.xml
+++ b/tools/cooja/apps/native_gateway/build.xml
@@ -25,6 +25,7 @@
   </target>
 
   <target name="jar" depends="clean, init, compile">
+    <mkdir dir="${lib}"/>
     <jar destfile="${lib}/native_gateway.jar" basedir="${build}">
       <manifest>
         <attribute name="Class-Path" value="."/>
diff --git a/tools/cooja/apps/serial2pipe/build.xml b/tools/cooja/apps/serial2pipe/build.xml
index 4e8a9647e..c3c3b3a5a 100644
--- a/tools/cooja/apps/serial2pipe/build.xml
+++ b/tools/cooja/apps/serial2pipe/build.xml
@@ -25,6 +25,7 @@
   </target>
 
   <target name="jar" depends="clean, init, compile">
+    <mkdir dir="${lib}"/>
     <jar destfile="${lib}/serial2pipe.jar" basedir="${build}">
       <manifest>
         <attribute name="Class-Path" value="."/>