diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 17966a1f7732..15a9f9eba773 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -270,11 +270,11 @@ static struct device_node *of_get_child_regulator(struct device_node *parent,
 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
 {
 	struct device_node *regnode = NULL;
-	char prop_name[32]; /* 32 is max size of property name */
+	char prop_name[256];
 
 	dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
 
-	snprintf(prop_name, 32, "%s-supply", supply);
+	snprintf(prop_name, sizeof(prop_name), "%s-supply", supply);
 	regnode = of_parse_phandle(dev->of_node, prop_name, 0);
 
 	if (!regnode) {