diff --git a/libc/kernel/uapi/linux/spi/spi.h b/libc/kernel/uapi/linux/spi/spi.h
index 39267a2..693e752 100644
--- a/libc/kernel/uapi/linux/spi/spi.h
+++ b/libc/kernel/uapi/linux/spi/spi.h
@@ -40,5 +40,6 @@
 #define SPI_TX_OCTAL _BITUL(13)
 #define SPI_RX_OCTAL _BITUL(14)
 #define SPI_3WIRE_HIZ _BITUL(15)
-#define SPI_MODE_USER_MASK (_BITUL(16) - 1)
+#define SPI_RX_CPHA_FLIP _BITUL(16)
+#define SPI_MODE_USER_MASK (_BITUL(17) - 1)
 #endif