diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c
index b022fff..732db47 100644
--- a/drivers/w1/slaves/w1_therm.c
+++ b/drivers/w1/slaves/w1_therm.c
@@ -141,7 +141,7 @@
 {
 	int i;
 
-	for (i=0; i<sizeof(w1_therm_families)/sizeof(w1_therm_families[0]); ++i)
+	for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i)
 		if (w1_therm_families[i].f->fid == fid)
 			return w1_therm_families[i].convert(rom);
 
@@ -238,7 +238,7 @@
 {
 	int err, i;
 
-	for (i=0; i<sizeof(w1_therm_families)/sizeof(w1_therm_families[0]); ++i) {
+	for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i) {
 		err = w1_register_family(w1_therm_families[i].f);
 		if (err)
 			w1_therm_families[i].broken = 1;
@@ -251,7 +251,7 @@
 {
 	int i;
 
-	for (i=0; i<sizeof(w1_therm_families)/sizeof(w1_therm_families[0]); ++i)
+	for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i)
 		if (!w1_therm_families[i].broken)
 			w1_unregister_family(w1_therm_families[i].f);
 }