diff --git a/ext/standard/html.c b/ext/standard/html.c
index 33747df8879..fd3e0400e0e 100644
--- a/ext/standard/html.c
+++ b/ext/standard/html.c
@@ -21,6 +21,7 @@
 /* $Id$ */
 
 #include "php.h"
+#include "php_config.h"
 #include "reg.h"
 #include "html.h"
 #include "php_string.h"