diff --git a/settings.h b/settings.h
index 985664c4..add3ee03 100644
--- a/settings.h
+++ b/settings.h
@@ -69,7 +69,7 @@
 #include <avr/io.h>
 #endif
 
-#if USE_XMEM_SPI_LOCK
+#if USE_XMEM_SPI_LOCK | defined(USE_MULTIPLE_APP_API)
 #include <xmem.h>
 #else
 #define XMEM_ACQUIRE_SPI() (void(0))