diff --git a/src/knx/bau_systemB.cpp b/src/knx/bau_systemB.cpp
index 05765e8..572dd4a 100644
--- a/src/knx/bau_systemB.cpp
+++ b/src/knx/bau_systemB.cpp
@@ -31,6 +31,11 @@ void BauSystemB::writeMemory()
     _memory.writeMemory();
 }
 
+Platform& BauSystemB::platform()
+{
+    return _platform;
+}
+
 ApplicationProgramObject& BauSystemB::parameters()
 {
     return _appProgram;
diff --git a/src/knx/bau_systemB.h b/src/knx/bau_systemB.h
index 674fb34..dfbced6 100644
--- a/src/knx/bau_systemB.h
+++ b/src/knx/bau_systemB.h
@@ -21,6 +21,7 @@ class BauSystemB : protected BusAccessUnit
     virtual bool enabled() = 0;
     virtual void enabled(bool value) = 0;
 
+    Platform& platform();
     ApplicationProgramObject& parameters();
     DeviceObject& deviceObject();
 
diff --git a/src/knx_facade.h b/src/knx_facade.h
index dbd303a..0b75248 100644
--- a/src/knx_facade.h
+++ b/src/knx_facade.h
@@ -73,6 +73,7 @@ template <class P, class B> class KnxFacade : private SaveRestore
 
     KnxFacade(B& bau) : _bau(bau)
     {
+        _platformPtr = static_cast<P*>(&bau.platform());
         manufacturerId(0xfa);
         bauNumber(platform().uniqueSerialNumber());
         _bau.addSaveRestore(this);