diff --git a/STM32F1/libraries/SPI/src/SPI.h b/STM32F1/libraries/SPI/src/SPI.h
index 7951a80..98fef47 100644
--- a/STM32F1/libraries/SPI/src/SPI.h
+++ b/STM32F1/libraries/SPI/src/SPI.h
@@ -88,8 +88,8 @@
 #endif
 
 // PC13 or PA4
-//#define BOARD_SPI_DEFAULT_SS PA4
-#define BOARD_SPI_DEFAULT_SS PC13
+#define BOARD_SPI_DEFAULT_SS PA4
+//#define BOARD_SPI_DEFAULT_SS PC13
 
 #define SPI_MODE0 SPI_MODE_0
 #define SPI_MODE1 SPI_MODE_1