diff --git a/minecraft-server/start-minecraftFinalSetup b/minecraft-server/start-minecraftFinalSetup
index 8357ec2d..7b0e3562 100755
--- a/minecraft-server/start-minecraftFinalSetup
+++ b/minecraft-server/start-minecraftFinalSetup
@@ -24,7 +24,7 @@ if [ -n "$ICON" -a ! -e server-icon.png ]; then
 fi
 
 # Make sure files exist and are valid JSON (for pre-1.12 to 1.12 upgrades)
-if [[ -z "ls *.json" ]]; then
+if [[ ! -z "find . -name '$*.json'" ]]; then
   echo "Checking JSON files"
   for j in *.json; do
     if [[ $(python -c "print open('$j').read().strip()==''") = True ]]; then