diff --git a/skylighting-core/xml/dtd.xml b/skylighting-core/xml/dtd.xml
index 0526efc..15c82a1 100644
--- a/skylighting-core/xml/dtd.xml
+++ b/skylighting-core/xml/dtd.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!DOCTYPE language[
+<!DOCTYPE language [
   <!ENTITY nmtoken "[\-\w\d\.:_]+">
   <!ENTITY entref  "(#[0-9]+|#[xX][0-9A-Fa-f]+|&nmtoken;);">
 ]>