diff --git a/libgfortran/ChangeLog b/libgfortran/ChangeLog
index d7447406615..6a8bcc221b7 100644
--- a/libgfortran/ChangeLog
+++ b/libgfortran/ChangeLog
@@ -1,3 +1,7 @@
+2018-10-02  Gerald Pfeifer  <gerald@pfeifer.com>
+
+	* io/close.c [!HAVE_UNLINK_OPEN_FILE]: Include <string.h>.
+
 2018-09-21  Janne Blomqvist  <jb@gcc.gnu.org>
 
 	* config.h.in: Regenerated.
diff --git a/libgfortran/io/close.c b/libgfortran/io/close.c
index cec7a084862..3dcd97ff139 100644
--- a/libgfortran/io/close.c
+++ b/libgfortran/io/close.c
@@ -26,6 +26,9 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #include "unix.h"
 #include "async.h"
 #include <limits.h>
+#if !HAVE_UNLINK_OPEN_FILE
+#include <string.h>
+#endif
 
 typedef enum
 { CLOSE_DELETE, CLOSE_KEEP, CLOSE_UNSPECIFIED }