diff --git a/examples/knx-demo-coupler/platformio-ci.ini b/examples/knx-demo-coupler/platformio-ci.ini
index 1a2bd5f..4a3e3d9 100644
--- a/examples/knx-demo-coupler/platformio-ci.ini
+++ b/examples/knx-demo-coupler/platformio-ci.ini
@@ -21,6 +21,7 @@ lib_deps =
 build_flags =
   -DMASK_VERSION=0x2920
   -Wno-unknown-pragmas
+  -DUSE_DATASECURE
 
 ;-----------------------------------------------------------
 
@@ -37,6 +38,7 @@ build_flags =
 #build_flags =
 #  -DMASK_VERSION=0x091A
 #  -Wno-unknown-pragmas
+#  -DUSE_DATASECURE
 
 ;---------------------------------------------------------
 
@@ -52,3 +54,4 @@ lib_deps =
 build_flags =
   -DMASK_VERSION=0x091A
   -Wno-unknown-pragmas
+  -DUSE_DATASECURE