diff --git a/ext/standard/sunfuncs.c b/ext/standard/sunfuncs.c
index 1c1709eb13c..8ec2ea96cca 100644
--- a/ext/standard/sunfuncs.c
+++ b/ext/standard/sunfuncs.c
@@ -27,8 +27,8 @@
 
 #include "php.h"
 #include "php_sunfuncs.h"
-#include "datetime.h"
 #include "php_ini.h"
+#include "ext/date/php_date.h"
 
 #include <assert.h>
 #include <math.h>