diff --git a/backends/frotz/dfrotz/common/buffer.c b/backends/frotz/dfrotz/common/buffer.c
index 298ac69c20e006957076c9af23dc56a6d28d2515..111bf9bd9c07f7c22f32c2a50b2ee4de2239d26e 100644
--- a/backends/frotz/dfrotz/common/buffer.c
+++ b/backends/frotz/dfrotz/common/buffer.c
@@ -18,6 +18,8 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 
+#include <string.h>
+
 #include "frotz.h"
 
 extern void stream_char (zchar);