diff --git a/globals.cpp b/globals.cpp
index 0627b98..a74211e 100644
--- a/globals.cpp
+++ b/globals.cpp
@@ -21,8 +21,11 @@ bool g_invertPaddleY = false;
 
 uint8_t g_luminanceCutoff = 122; // reasonable values are 127 and 128 for 32-bit (SDL); and 122/123 for 16-bit (teensy) depending on whether we're talking about white-on-black or black-on-white
 
+#ifdef TEENSYDUINO
+EXTMEM
+#endif
 char debugBuf[255];
 
 #ifdef TEENSYDUINO
-char fsbuf[200];
+EXTMEM char fsbuf[200];
 #endif
diff --git a/globals.h b/globals.h
index 6d7572d..3bd0d30 100644
--- a/globals.h
+++ b/globals.h
@@ -1,6 +1,10 @@
 #ifndef __GLOBALS_H
 #define __GLOBALS_H
 
+#ifdef TEENSYDUINO
+#include <Arduino.h>
+#endif
+
 #include <stdint.h>
 
 #include "filemanager.h"