diff --git a/.travis.yml b/.travis.yml
index c8d6e30..6a1c0ba 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -85,8 +85,10 @@
         - pip install -U platformio
         - platformio update      
       script:
+        - mkdir -p /tmp/build
+        - cp examples/knx-usb/custom_hwids.py /tmp/build
         - platformio settings set force_verbose yes
-        - platformio ci --lib="." --project-conf=examples/knx-usb/platformio.ini examples/knx-usb/src/main.cpp     
+        - platformio ci --build-dir /tmp/build --lib="." --project-conf=examples/knx-usb/platformio.ini examples/knx-usb/src/main.cpp     
       
 notifications:
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