diff --git a/drivers/at86rf2xx/aes_spi.c b/drivers/at86rf2xx/aes_spi.c
index eb79393e9a..d97f0e9706 100644
--- a/drivers/at86rf2xx/aes_spi.c
+++ b/drivers/at86rf2xx/aes_spi.c
@@ -25,8 +25,8 @@
 
 #define AES_DEBUG(...)  DEBUG("[at86rf2xx_aes_spi]: "__VA_ARGS__)
 
-#define AT86RF2XX_CMD_SRAM_READ             (0b00000000)
-#define AT86RF2XX_CMD_SRAM_WRITE            (0b01000000)
+#define AT86RF2XX_CMD_SRAM_READ             (0x00)
+#define AT86RF2XX_CMD_SRAM_WRITE            (0x40)
 
 static inline
 void at86rf2xx_spi_get_bus(const at86rf2xx_t *dev)