diff --git a/src/Hydruino.cpp b/src/Hydruino.cpp
index 7fec707..e4322ec 100644
--- a/src/Hydruino.cpp
+++ b/src/Hydruino.cpp
@@ -70,6 +70,9 @@ Hydruino::~Hydruino()
     while (_objects.size()) { _objects.erase(_objects.begin()); }
     while (_pinOneWire.size()) { dropOneWireForPin(_pinOneWire.begin()->first); }
     while (_pinMuxers.size()) { _pinMuxers.erase(_pinMuxers.begin()); }
+#ifndef HYDRO_DISABLE_MULTITASKING
+    while (_pinExpanders.size()) { _pinExpanders.erase(_pinExpanders.begin()); }
+#endif
     deallocateEEPROM();
     deallocateRTC();
     deallocateSD();