diff --git a/drivers/net/tsec.c b/drivers/net/tsec.c
index e354fad..082cdec 100644
--- a/drivers/net/tsec.c
+++ b/drivers/net/tsec.c
@@ -166,7 +166,7 @@
 	out_be32(&regs->rctrl, 0x00000000);
 
 	/* Init RMON mib registers */
-	memset((void *)&(regs->rmon), 0, sizeof(rmon_mib_t));
+	memset((void *)&regs->rmon, 0, sizeof(regs->rmon));
 
 	out_be32(&regs->rmon.cam1, 0xffffffff);
 	out_be32(&regs->rmon.cam2, 0xffffffff);