diff --git a/src/dos/program_autotype.h b/src/dos/program_autotype.h
index 42c83705..9f70b8ba 100644
--- a/src/dos/program_autotype.h
+++ b/src/dos/program_autotype.h
@@ -18,6 +18,11 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
+#ifndef DOSBOX_PROGRAM_AUTOTYPE_H
+#define DOSBOX_PROGRAM_AUTOTYPE_H
+
+#include <string>
+
 #include "programs.h"
 
 class AUTOTYPE : public Program {
@@ -35,4 +40,6 @@ private:
 	                   double &value);
 };
 
-void AUTOTYPE_ProgramStart(Program **make);
\ No newline at end of file
+void AUTOTYPE_ProgramStart(Program **make);
+
+#endif /* DOSBOX_PROGRAM_AUTOTYPE_H */