diff --git a/src/libnazgul.h b/src/libnazgul.h
index 7f36691..ef5a98a 100644
--- a/src/libnazgul.h
+++ b/src/libnazgul.h
@@ -1,5 +1,8 @@
 #ifndef _LIBNAZGUL
 #define _LIBNAZGUL 1
 
+#include "nzg_global.h"
+#include "nzg_iface.h"
+#include "nzg_proto.h"
 
 #endif
diff --git a/src/nzg_proto.h b/src/nzg_proto.h
index 13eba55..2353ac9 100644
--- a/src/nzg_proto.h
+++ b/src/nzg_proto.h
@@ -1,3 +1,5 @@
+#ifndef _NZG_PROTO
+#define _NZG_PROTO 1
 
 char **msgSpaceIdList(void);
 
@@ -18,3 +20,4 @@ msgSpace *msgSpaceOpen(msgSpaceId spaceId);
 void msgSpaceDelete(msgSpaceId spaceId);
 msgSpaceId msgSp2nzgId(msgSpaceId spaceId);
 
+#endif