diff --git a/examples/knx-usb/platformio-ci.ini b/examples/knx-usb/platformio-ci.ini
index 5f96f44..4e3322b 100644
--- a/examples/knx-usb/platformio-ci.ini
+++ b/examples/knx-usb/platformio-ci.ini
@@ -28,3 +28,4 @@ build_flags =
   -DUSE_USB
   -DUSE_TINYUSB
   -Wno-unknown-pragmas
+  -DUSE_DATASECURE