diff --git a/ext/c/lexer.h b/ext/c/lexer.h
index 90f5014..71241c4 100644
--- a/ext/c/lexer.h
+++ b/ext/c/lexer.h
@@ -1,8 +1,8 @@
-#include "liboga.h"
-
 #ifndef LIBOGA_XML_LEXER_H
 #define LIBOGA_XML_LEXER_H
 
+#include "liboga.h"
+
 extern void Init_liboga_xml_lexer();
 
 #endif