diff --git a/csrc/u8x8_byte.c b/csrc/u8x8_byte.c
index ed3d83f5..2aaaa9e6 100644
--- a/csrc/u8x8_byte.c
+++ b/csrc/u8x8_byte.c
@@ -315,7 +315,7 @@ void u8x8_byte_set_ks0108_cs(u8x8_t *u8x8, uint8_t arg)
   arg = arg >> 1;
   u8x8_gpio_call(u8x8, U8X8_MSG_GPIO_CS1, arg&1);
   arg = arg >> 2;
-  u8x8_gpio_call(u8x8, U8X8_MSG_GPIO_CS2, arg&2);
+  u8x8_gpio_call(u8x8, U8X8_MSG_GPIO_CS2, arg&1);
 }
 
 /* 6800 mode */