diff --git a/drivers/isdn/mISDN/dsp.h b/drivers/isdn/mISDN/dsp.h
index afe4173ae00770524eb5a3faf59d1eb98b4c0486..fc1733a088459e2ae27479ca75f6e343ac4b3a0b 100644
--- a/drivers/isdn/mISDN/dsp.h
+++ b/drivers/isdn/mISDN/dsp.h
@@ -76,7 +76,9 @@ extern u8 dsp_silence;
 #define MAX_SECONDS_JITTER_CHECK 5
 
 extern struct timer_list dsp_spl_tl;
-extern u32 dsp_spl_jiffies;
+
+/* the datatype need to match jiffies datatype */
+extern unsigned long dsp_spl_jiffies;
 
 /* the structure of conferences:
  *
diff --git a/drivers/isdn/mISDN/dsp_cmx.c b/drivers/isdn/mISDN/dsp_cmx.c
index 0c104b97683592f0f66b69faa67c8e62b8d50322..a4f05c54c32b021cc04fb9ea65ece506a1e94e2a 100644
--- a/drivers/isdn/mISDN/dsp_cmx.c
+++ b/drivers/isdn/mISDN/dsp_cmx.c
@@ -1624,7 +1624,7 @@ dsp_cmx_send_member(struct dsp *dsp, int len, s32 *c, int members)
 
 static u32	jittercount; /* counter for jitter check */
 struct timer_list dsp_spl_tl;
-u32	dsp_spl_jiffies; /* calculate the next time to fire */
+unsigned long	dsp_spl_jiffies; /* calculate the next time to fire */
 static u16	dsp_count; /* last sample count */
 static int	dsp_count_valid; /* if we have last sample count */