diff --git a/fireflyiii/rootfs/etc/cont-init.d/99-run.sh b/fireflyiii/rootfs/etc/cont-init.d/99-run.sh
index ea8f457f1..08728770b 100644
--- a/fireflyiii/rootfs/etc/cont-init.d/99-run.sh
+++ b/fireflyiii/rootfs/etc/cont-init.d/99-run.sh
@@ -11,7 +11,7 @@ APP_KEY="$(bashio::config 'APP_KEY')"
 # If not base64
 if [[ ! "$APP_KEY" == *"base64"* ]]; then
   # Check APP_KEY format
-  if [ ! ${#APP_KEY} = 32 ]; then bashio::exit.nok "Your APP_KEY has ${#APP_KEY} instead of 32 characters"; fi
+  if [ ! "${#APP_KEY}" = 32 ]; then bashio::exit.nok "Your APP_KEY has ${#APP_KEY} instead of 32 characters"; fi
 fi
 
 # Backup APP_KEY file