diff --git a/config.h b/config.h
index e842b95..aae63c9 100644
--- a/config.h
+++ b/config.h
@@ -27,6 +27,7 @@
 #define CONFIG_H_INCLUDED
 
 #include <Arduino.h>
+#include <SD.h>
 #include "midinotes.h"
 
 // ATTENTION! For better latency you have to redefine AUDIO_BLOCK_SAMPLES from
@@ -167,7 +168,7 @@
 //#define SDCARD_SCK_PIN   14
 #ifndef TEENSY4
 // Teensy 3.5 & 3.6 SD card
-#define SDCARD_CS_PIN    BUILTIN_SDCARD
+#define SDCARD_CS_PIN    4 //BUILTIN_SDCARD
 #define SDCARD_MOSI_PIN  11
 #define SDCARD_SCK_PIN   13
 #else