diff --git a/src/spiram-fast.h b/src/spiram-fast.h
index cd75d2d..6eb6606 100644
--- a/src/spiram-fast.h
+++ b/src/spiram-fast.h
@@ -247,6 +247,10 @@ class ESP8266SPIRAM {
 
 #include <SPI.h>
 
+#ifndef SPECIAL
+  #define UNDEF_SPECIAL
+  #define SPECIAL 0xf0
+#endif
 class ESP8266SPIRAM {
     private:
         uint8_t csPin;