diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index 7b54c21..47bcd52 100644
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -5,7 +5,7 @@ echo "{\n"\
   "  \"port\": $PA11Y_PORT,\n"\
   "  \"noindex\": $PA11Y_NOINDEX,\n"\
   "  \"readonly\": $PA11Y_READONLY,\n"\
-  "  \"sitemessage\": $PA11Y_SITEMESSAGE,\n"\
+  "  \"sitemessage\": \"$PA11Y_SITEMESSAGE\",\n"\
   "  \"webservice\": {\n"\
 	"    \"database\": \"$PA11Y_WEBSERVICE_DATABASE\",\n"\
 	"    \"host\": \"$PA11Y_WEBSERVICE_HOST\",\n"\