diff --git a/voice-client/files/usr/libexec/rpcd/voice.asterisk b/voice-client/files/usr/libexec/rpcd/voice.asterisk
index e1271adf7..f435f208b 100755
--- a/voice-client/files/usr/libexec/rpcd/voice.asterisk
+++ b/voice-client/files/usr/libexec/rpcd/voice.asterisk
@@ -114,7 +114,7 @@ case "$1" in
 					json_add_object ""
 				        json_add_string uniqueid "$uniqueid"
 				        json_add_string time "$timestart"
-				        json_add_string duration $((startdate - enddate))
+				        json_add_int duration $((startdate - enddate))
 				        json_add_string disposition "$(echo $line | awk -F',' '{print $(NF-3)}')"
 				        json_add_string direction "$direction"
 				        json_add_string from "$from"