diff --git a/bios.cpp b/bios.cpp
index c7ef5b6..b329a5b 100644
--- a/bios.cpp
+++ b/bios.cpp
@@ -286,11 +286,11 @@ uint8_t BIOS::GetAction(int8_t selection)
 	   (resetButtonDebouncer.read() == HIGH)
 #endif
 	   ) {
-#ifndef TEENSYDUINO
-      usleep(100)
+#ifdef TEENSYDUINO
+      threads.delay(1);
+	#else
+      usleep(100);
 #endif
-	threads.delay(1);
-	;
       // Wait for either a keypress or the reset button to be pressed
     }
 
diff --git a/globals.h b/globals.h
index 5c18710..1162169 100644
--- a/globals.h
+++ b/globals.h
@@ -54,7 +54,9 @@ extern uint32_t g_speed;
 extern bool g_invertPaddleX;
 extern bool g_invertPaddleY;
 
+#ifdef TEENSYDUINO
 #include <TeensyThreads.h>
 extern Threads::Mutex spi_lock;
+#endif
 
 #endif