diff --git a/drivers/net/sis190.c b/drivers/net/sis190.c
index ed4bc91..31dd3f0 100644
--- a/drivers/net/sis190.c
+++ b/drivers/net/sis190.c
@@ -366,7 +366,7 @@
  * Maximum number of multicast addresses to filter (vs. Rx-all-multicast).
  * The chips use a 64 element hash table based on the Ethernet CRC.
  */
-static int multicast_filter_limit = 32;
+static const int multicast_filter_limit = 32;
 
 static void __mdio_cmd(void __iomem *ioaddr, u32 ctl)
 {