diff --git a/drivers/net/wimax/i2400m/fw.c b/drivers/net/wimax/i2400m/fw.c
index c9c711dcd0e6bb9d7ce988f42bc7e6dd7877a37b..a89b5685e68b36d5735bc9591f97f621440cb424 100644
--- a/drivers/net/wimax/i2400m/fw.c
+++ b/drivers/net/wimax/i2400m/fw.c
@@ -652,7 +652,7 @@ static int i2400m_download_chunk(struct i2400m *i2400m, const void *chunk,
 	struct device *dev = i2400m_dev(i2400m);
 	struct {
 		struct i2400m_bootrom_header cmd;
-		u8 cmd_payload[chunk_len];
+		u8 cmd_payload[];
 	} __packed *buf;
 	struct i2400m_bootrom_header ack;