diff --git a/drivers/staging/comedi/drivers/dt3000.c b/drivers/staging/comedi/drivers/dt3000.c
index 2edf3ee91300007c4dff503774bca1f2fe04b57b..4ad176fc14ad1748cbc73d9d485d9e7dcc5e06df 100644
--- a/drivers/staging/comedi/drivers/dt3000.c
+++ b/drivers/staging/comedi/drivers/dt3000.c
@@ -368,7 +368,7 @@ static int dt3k_ns_to_timer(unsigned int timer_base, unsigned int *nanosec,
 	}
 
 	prescale = 15;
-	base = timer_base * (1 << prescale);
+	base = timer_base * (prescale + 1);
 	divider = 65535;
 	*nanosec = divider * base;
 	return (prescale << 16) | (divider);