diff --git a/drivers/net/ns83820.c b/drivers/net/ns83820.c
index b0c3b6a..f3924fb 100644
--- a/drivers/net/ns83820.c
+++ b/drivers/net/ns83820.c
@@ -651,7 +651,7 @@
 static void fastcall phy_intr(struct net_device *ndev)
 {
 	struct ns83820 *dev = PRIV(ndev);
-	static char *speeds[] = { "10", "100", "1000", "1000(?)", "1000F" };
+	static const char *speeds[] = { "10", "100", "1000", "1000(?)", "1000F" };
 	u32 cfg, new_cfg;
 	u32 tbisr, tanar, tanlpar;
 	int speed, fullduplex, newlinkstate;