diff --git a/script/caput_settings.py b/script/caput_settings.py
index e272349..36eac8d 100644
--- a/script/caput_settings.py
+++ b/script/caput_settings.py
@@ -26,7 +26,7 @@ caput ("X12SA-OP-BPM6:ValuesPerRead", 1)
 
 caput ("X12SA-OP-BPM6:AveragingTime",  0.1)
 
-caput ("X12SA-OP-BPM6:NumChannels", 4)
+caput ("X12SA-OP-BPM6:NumChannels", "4")
 
 caput ("X12SA-OP-BPM6:ReadFormat", "Binary")