diff --git a/examples/stm32/f4/stm32f429i-discovery/spi/spi-mems.c b/examples/stm32/f4/stm32f429i-discovery/spi/spi-mems.c
index f20d58f..bcfe5bb 100644
--- a/examples/stm32/f4/stm32f429i-discovery/spi/spi-mems.c
+++ b/examples/stm32/f4/stm32f429i-discovery/spi/spi-mems.c
@@ -152,7 +152,7 @@ read_xyz(int16_t vecs[3])
 	gpio_set(GPIOC, GPIO1); /* CS* deselect */
 	vecs[0] = (buf[1] << 8 | buf[0]);
 	vecs[1] = (buf[3] << 8 | buf[2]);
-	vecs[3] = (buf[5] << 8 | buf[4]);
+	vecs[2] = (buf[5] << 8 | buf[4]);
 	return read_reg(0x27); /* Status register */
 }