diff --git a/settings.h b/settings.h
index 29904b13..40f97979 100644
--- a/settings.h
+++ b/settings.h
@@ -34,6 +34,9 @@
 /* Set this to 1 if you are using a Black Widdow */
 #define USE_UHS_BLACK_WIDDOW 0
 
+/* Set this to 1 if you are using xmem2 and expanded memory and multitasking */
+#define USE_XMEM_SPI_LOCK 0
+
 ////////////////////////////////////////////////////////////////////////////////
 // MASS STORAGE
 ////////////////////////////////////////////////////////////////////////////////
@@ -66,4 +69,11 @@
 #include <avr/io.h>
 #endif
 
+#if USE_XMEM_SPI_LOCK
+#include <xmem.h>
+#else
+#define XMEM_ACQUIRE_SPI() (void(0))
+#define XMEM_RELEASE_SPI() (void(0))
+#endif
+
 #endif	/* SETTINGS_H */