diff --git a/usr/lib/greenboot/check/required.d/02_watchdog.sh b/usr/lib/greenboot/check/required.d/02_watchdog.sh
index b072288..959254f 100644
--- a/usr/lib/greenboot/check/required.d/02_watchdog.sh
+++ b/usr/lib/greenboot/check/required.d/02_watchdog.sh
@@ -4,6 +4,7 @@ set -eo pipefail
 source_configuration_file() {
   GREENBOOT_CONFIGURATION_FILE=/etc/greenboot/greenboot.conf
   if test -f "$GREENBOOT_CONFIGURATION_FILE"; then
+    # shellcheck source=etc/greenboot/greenboot.conf
     source $GREENBOOT_CONFIGURATION_FILE
   fi
 }
@@ -54,7 +55,7 @@ if [ "${1}" != "--source-only" ]; then
     echo "Watchdog check is disabled"
     exit 0
   fi
-  
+
   set_grace_period
 
   SECONDS_IN_AN_HOUR=$((60 * 60))