diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 9fda9a0ec016..89ec6aa220cf 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -685,7 +685,7 @@ static int _set_opp_custom(const struct opp_table *opp_table,
 
 	data->old_opp.rate = old_freq;
 	size = sizeof(*old_supply) * opp_table->regulator_count;
-	if (IS_ERR(old_supply))
+	if (!old_supply)
 		memset(data->old_opp.supplies, 0, size);
 	else
 		memcpy(data->old_opp.supplies, old_supply, size);