diff --git a/.github/workflows/shellcheck_and_shellfmt.yml b/.github/workflows/shellcheck_and_shellfmt.yml
index 26e3ff9..0e10e14 100644
--- a/.github/workflows/shellcheck_and_shellfmt.yml
+++ b/.github/workflows/shellcheck_and_shellfmt.yml
@@ -4,7 +4,7 @@ on:
   - push
   - pull_request
 jobs:
-  sh-checker:
+  shellfmt:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
@@ -13,10 +13,17 @@ jobs:
         uses: luizm/action-sh-checker@v0.1.10
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # Optional if sh_checker_comment is false.
-          SHELLCHECK_OPTS: --color=always --shell=bash -x --source-path=SCRIPTDIR # Optional: exclude some shellcheck warnings.
           SHFMT_OPTS: -l -i 4 -w # Optional: pass arguments to shfmt.
         with:
+          sh_checker_shellcheck_disable: true
           sh_checker_comment: true
           sh_checker_exclude: |
                               src/
                               debian/postrm
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+      - name: Run shellcheck
+        run: ./shellcheck/docker_build_and_run_shellcheck.sh
diff --git a/bin/hardening.sh b/bin/hardening.sh
index 70d53f5..7d64884 100755
--- a/bin/hardening.sh
+++ b/bin/hardening.sh
@@ -294,7 +294,7 @@ if [ "$BATCH_MODE" ]; then
     BATCH_SUMMARY+="RUN_CHECKS:${TOTAL_TREATED_CHECKS:-0} "
     BATCH_SUMMARY+="TOTAL_CHECKS_AVAIL:${TOTAL_CHECKS:-0}"
     if [ "$TOTAL_TREATED_CHECKS" != 0 ]; then
-        CONFORMITY_PERCENTAGE=$(div $(($PASSED_CHECKS * 100)) $TOTAL_TREATED_CHECKS)
+        CONFORMITY_PERCENTAGE=$(div $((PASSED_CHECKS * 100)) $TOTAL_TREATED_CHECKS)
         BATCH_SUMMARY+=" CONFORMITY_PERCENTAGE:$(printf "%s" "$CONFORMITY_PERCENTAGE")"
     else
         BATCH_SUMMARY+=" CONFORMITY_PERCENTAGE:N.A" # No check runned, avoid division by 0
@@ -307,8 +307,8 @@ else
     printf "%30s [ %7s ]\n" "Total Passed Checks :" "$PASSED_CHECKS/$TOTAL_TREATED_CHECKS"
     printf "%30s [ %7s ]\n" "Total Failed Checks :" "$FAILED_CHECKS/$TOTAL_TREATED_CHECKS"
 
-    ENABLED_CHECKS_PERCENTAGE=$(div $(($TOTAL_TREATED_CHECKS * 100)) $TOTAL_CHECKS)
-    CONFORMITY_PERCENTAGE=$(div $(($PASSED_CHECKS * 100)) $TOTAL_TREATED_CHECKS)
+    ENABLED_CHECKS_PERCENTAGE=$(div $((TOTAL_TREATED_CHECKS * 100)) $TOTAL_CHECKS)
+    CONFORMITY_PERCENTAGE=$(div $((PASSED_CHECKS * 100)) $TOTAL_TREATED_CHECKS)
     printf "%30s %s %%\n" "Enabled Checks Percentage :" "$ENABLED_CHECKS_PERCENTAGE"
     if [ "$TOTAL_TREATED_CHECKS" != 0 ]; then
         printf "%30s %s %%\n" "Conformity Percentage :" "$CONFORMITY_PERCENTAGE"