diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme680_core.c
index 6aeac132394c..ac9a737481dc 100644
--- a/drivers/iio/chemical/bme680_core.c
+++ b/drivers/iio/chemical/bme680_core.c
@@ -128,7 +128,7 @@ struct bme680_data {
 	u16 heater_temp;
 
 	struct {
-		s32 chan[4];
+		s32 chan[BME680_NUM_CHANNELS];
 		aligned_s64 ts;
 	} scan;