diff --git a/drivers/char/hw_random/ba431-rng.c b/drivers/char/hw_random/ba431-rng.c
index b0a39032c610..810c8cd5629a 100644
--- a/drivers/char/hw_random/ba431-rng.c
+++ b/drivers/char/hw_random/ba431-rng.c
@@ -147,7 +147,7 @@ static int ba431_trng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
 		}
 	}
 
-	n *= sizeof(data);
+	n *= sizeof(*data);
 	return (n || !wait) ? n : -EIO;
 }