diff --git a/RF24.cpp b/RF24.cpp
index 91b5a2b..0d5e99e 100644
--- a/RF24.cpp
+++ b/RF24.cpp
@@ -22,6 +22,7 @@
 
 void RF24::csn(int mode) 
 {
+  SPI.setDataMode(SPI_MODE0);
   digitalWrite(csn_pin,mode);
 }