diff --git a/drivers/clk/clk-cdce925.c b/drivers/clk/clk-cdce925.c
index 4d49cc1659c0..56b69d4fe4c2 100644
--- a/drivers/clk/clk-cdce925.c
+++ b/drivers/clk/clk-cdce925.c
@@ -625,7 +625,12 @@ static int cdce925_probe(struct i2c_client *client)
 	int i;
 	int err;
 	struct device_node *np_output;
-	char child_name[6];
+	/*
+	 * The PLL number isn't a compile time constant so GCC can't infer
+	 * the number. Make the stack buffer large enough to hold any int
+	 * so Wformat-truncation does not complain.
+	 */
+	char child_name[15];
 	struct regmap_config config = {
 		.name = "configuration0",
 		.reg_bits = 8,
@@ -697,7 +702,7 @@ static int cdce925_probe(struct i2c_client *client)
 			dev_err(&client->dev, "Failed register PLL %d\n", i);
 			goto error;
 		}
-		sprintf(child_name, "PLL%d", i+1);
+		snprintf(child_name, sizeof(child_name), "PLL%d", i + 1);
 		np_output = of_get_child_by_name(node, child_name);
 		if (!np_output)
 			continue;