diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
index 48b3c812b9ec..f5df8a33127c 100644
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -335,7 +335,7 @@ static int hwrng_fillfn(void *unused)
 		add_hwgenerator_randomness((void *)rng_fillbuf, rc,
 					   (rc*current_quality)>>10);
 	}
-	hwrng_fill = 0;
+	hwrng_fill = NULL;
 	return 0;
 }