diff --git a/ext/standard/datetime.c b/ext/standard/datetime.c
index ed8eef6cfe1..11cd604e9bb 100644
--- a/ext/standard/datetime.c
+++ b/ext/standard/datetime.c
@@ -29,6 +29,9 @@
 #include "php_globals.h"
 
 #include <time.h>
+#ifdef HAVE_SYS_TIME_H
+# include <sys/time.h>
+#endif
 #include <stdio.h>
 
 char *mon_full_names[] =