diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 4159ebcec2bb..c6915b835396 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -102,8 +102,8 @@
 #define RCAR_IRQ_RECV	(MNR | MAL | MST | MAT | MDR)
 #define RCAR_IRQ_STOP	(MST)
 
-#define RCAR_IRQ_ACK_SEND	(~(MAT | MDE) & 0xFF)
-#define RCAR_IRQ_ACK_RECV	(~(MAT | MDR) & 0xFF)
+#define RCAR_IRQ_ACK_SEND	(~(MAT | MDE) & 0x7F)
+#define RCAR_IRQ_ACK_RECV	(~(MAT | MDR) & 0x7F)
 
 #define ID_LAST_MSG	(1 << 0)
 #define ID_FIRST_MSG	(1 << 1)