diff --git a/dev/smbus/cyapa/cyapa.c b/dev/smbus/cyapa/cyapa.c
--- a/dev/smbus/cyapa/cyapa.c
+++ b/dev/smbus/cyapa/cyapa.c
@@ -485,7 +485,7 @@
 	if (!sc)
 		return ENOMEM;
 
-	bzero(sc, sizeof(struct cyapa_softc *));
+	bzero(sc, sizeof(*sc));
 
 	lockinit(&sc->lk, "cyapa", 0, 0);
 	sc->reporting_mode = 1;