diff --git a/drivers/isdn/i4l/isdn_common.c b/drivers/isdn/i4l/isdn_common.c
index 6a2ef0a..9c926e4 100644
--- a/drivers/isdn/i4l/isdn_common.c
+++ b/drivers/isdn/i4l/isdn_common.c
@@ -1822,7 +1822,7 @@
 	return 0;
 }
 
-static struct file_operations isdn_fops =
+static const struct file_operations isdn_fops =
 {
 	.owner		= THIS_MODULE,
 	.llseek		= no_llseek,