diff --git a/firmware/types.h b/firmware/types.h
index 6a88eeba78..268d433d64 100644
--- a/firmware/types.h
+++ b/firmware/types.h
@@ -17,4 +17,9 @@
  *
  ****************************************************************************/
 
+#ifndef __TYPES_H
+#define __TYPES_H
+
 typedef unsigned char bool;
+
+#endif