diff -puN drivers/isdn/mISDN/dsp_hwec.c~drivers-isdn-misdn-use-array_size drivers/isdn/mISDN/dsp_hwec.c
--- a/drivers/isdn/mISDN/dsp_hwec.c~drivers-isdn-misdn-use-array_size
+++ a/drivers/isdn/mISDN/dsp_hwec.c
@@ -43,7 +43,7 @@ static struct mISDN_dsp_element dsp_hwec
 	.free = NULL,
 	.process_tx = NULL,
 	.process_rx = NULL,
-	.num_args = sizeof(args) / sizeof(struct mISDN_dsp_element_arg),
+	.num_args = ARRAY_SIZE(args),
 	.args = args,
 };
 struct mISDN_dsp_element *dsp_hwec = &dsp_hwec_p;