diff --git a/.github/workflows/arduino_ci.yml b/.github/workflows/arduino_ci.yml
index b4f60aa..b31fcc9 100644
--- a/.github/workflows/arduino_ci.yml
+++ b/.github/workflows/arduino_ci.yml
@@ -93,8 +93,7 @@ jobs:
           # done;
           # export mser=$(jq --compact-output --null-input '$ARGS.positional' --args -- "${seriallist[@]}")
 
-          mser=`./py_checkusb.py --repo ${REPO} --list serial --json`
-          echo '$mser' |jq '."$REPO"'
+          mser=$(./py_checkusb.py --repo ${REPO} --list serial --json | jq '."$REPO"')
           echo "serials_hil="$mser
 
           #echo serials_hil="$mser" >> $GITHUB_OUTPUT