diff --git a/wifi_diag/do_wifi_diag.bash b/wifi_diag/do_wifi_diag.bash
index f7434c22..6b3dd3e9 100755
--- a/wifi_diag/do_wifi_diag.bash
+++ b/wifi_diag/do_wifi_diag.bash
@@ -21,7 +21,7 @@ present=(
 )
 killcommand=0
 for i in "${present[@]}"; do
-  present=$(expr length "$(which $i)")
+  present=`which $i | awk '{ print length }'`
   if [[ $present -gt 0 ]]; then
     :
   else