diff --git a/deploy.sh b/deploy.sh
index ed87e0d..466cf0f 100755
--- a/deploy.sh
+++ b/deploy.sh
@@ -62,7 +62,8 @@ fi
 
 # Get a space-separated list of the config filenames.
 # This will be used on the remote server to create symlinks.
-CONFIG_FILES=$(ls "$SOURCE_SITES_DIR")
+# The `tr` command ensures the list is on a single line, preventing syntax errors.
+CONFIG_FILES=$(ls "$SOURCE_SITES_DIR" | tr '\n' ' ')
 echo "-> Found site config files to process: $CONFIG_FILES"
 
 # Find all unique domains for Certbot.