diff --git a/drivers/net/ethernet/sfc/selftest.c b/drivers/net/ethernet/sfc/selftest.c
index 10b6173d557dbbc31a5aefb36f06bb15f13442de..b605dfd5c7bc7146600908b1c7a40f79b28dfd53 100644
--- a/drivers/net/ethernet/sfc/selftest.c
+++ b/drivers/net/ethernet/sfc/selftest.c
@@ -46,7 +46,7 @@ struct efx_loopback_payload {
 	struct iphdr ip;
 	struct udphdr udp;
 	__be16 iteration;
-	const char msg[64];
+	char msg[64];
 } __packed;
 
 /* Loopback test source MAC address */