diff --git a/ext/mysqlnd/mysqlnd_charset.h b/ext/mysqlnd/mysqlnd_charset.h
index 6434438614b..b9dc6b69da9 100644
--- a/ext/mysqlnd/mysqlnd_charset.h
+++ b/ext/mysqlnd/mysqlnd_charset.h
@@ -18,12 +18,16 @@
   +----------------------------------------------------------------------+
 */
 
+#ifndef MYSQLND_CHARSET_H
+#define MYSQLND_CHARSET_H
+
 PHPAPI ulong mysqlnd_cset_escape_quotes(const MYSQLND_CHARSET * const charset, char *newstr,
 										const char *escapestr, int escapestr_len TSRMLS_DC);
 
 PHPAPI ulong mysqlnd_cset_escape_slashes(const MYSQLND_CHARSET * const cset, char *newstr,
 										 const char *escapestr, int escapestr_len TSRMLS_DC);
 
+#endif /* MYSQLND_CHARSET_H */
 
 /*
  * Local variables: