diff --git a/drivers/net/sungem.c b/drivers/net/sungem.c
index 08ea61d..bb07b79 100644
--- a/drivers/net/sungem.c
+++ b/drivers/net/sungem.c
@@ -2914,7 +2914,7 @@
 	int use_idprom = 1;
 
 	if (pcp != NULL) {
-		unsigned char *addr;
+		const unsigned char *addr;
 		int len;
 
 		addr = of_get_property(pcp->prom_node, "local-mac-address",