diff --git a/examples/knx-demo/platformio-ci.ini b/examples/knx-demo/platformio-ci.ini
index 2fee107..e2b04e2 100644
--- a/examples/knx-demo/platformio-ci.ini
+++ b/examples/knx-demo/platformio-ci.ini
@@ -21,6 +21,7 @@ lib_deps =
 build_flags =
   -DMASK_VERSION=0x27B0
   -Wno-unknown-pragmas
+  -DUSE_DATASECURE
 ;-----------------------------------------------------------
 
 
@@ -34,8 +35,9 @@ lib_deps =
   knx
 
 build_flags =
-   -DMASK_VERSION=0x57B0
-  -Wno-unknown-pragmas
+    -DMASK_VERSION=0x57B0
+    -Wno-unknown-pragmas
+    -DUSE_DATASECURE
 
 [env:nodemcuv2_tp]
 platform = espressif8266
@@ -48,6 +50,7 @@ lib_deps =
 build_flags =
   -DMASK_VERSION=0x07B0
   -Wno-unknown-pragmas
+  -DUSE_DATASECURE
 
 ;---------------------------------------------------------
 
@@ -63,6 +66,7 @@ lib_deps =
 build_flags =
   -DMASK_VERSION=0x57B0
   -Wno-unknown-pragmas
+  -DUSE_DATASECURE
 
 [env:esp32dev_tp]
 platform = espressif32
@@ -74,3 +78,4 @@ lib_deps =
 build_flags =
   -DMASK_VERSION=0x07B0
   -Wno-unknown-pragmas
+  -DUSE_DATASECURE