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diff --git a/src/lib/types.h b/src/lib/types.h
index 63b7f3ad..fa880848 100644
--- a/src/lib/types.h
+++ b/src/lib/types.h
@@ -22,12 +22,16 @@
 /*
  * Just some handy typedefs that make it easier to think about the low
  * level code
- */
+ */
+
+#ifndef _TYPE_H_
+#define _TYPE_H_
 
 typedef unsigned char byte;
 typedef unsigned short word;
 typedef unsigned long  dword;
 typedef signed char sbyte;
 typedef signed short sword;
-typedef signed long sdword;
+typedef signed long sdword;
 
+#endif/*_TYPE_H_*/