Index: firmware/FSC/src/w5100_spi_interface.h
===================================================================
--- firmware/FSC/src/w5100_spi_interface.h	(revision 17933)
+++ firmware/FSC/src/w5100_spi_interface.h	(revision 18181)
@@ -233,5 +233,5 @@
 U08 w5100_get_RX(U08 NumBytes, BOOL send_ACK);
 void w5100_TX(U08 NumBytes, U08 *str);
-U16 w5100_set_TX(U08* string, U16 NumBytes);
+U16 w5100_set_TX(volatile U08* string, U16 NumBytes);
 
 extern bool w5100_needs_init;