diff --git a/core/exports/librr/types.h b/core/exports/librr/types.h
index 481448c..64e049e 100644
--- a/core/exports/librr/types.h
+++ b/core/exports/librr/types.h
@@ -27,10 +27,20 @@ typedef i64_t                   isz_t;
 #endif
 
 
+#ifndef TRUE
 #define TRUE  (1)
-#define FALSE (0)
+#endif
 
+#ifndef FALSE
+#define FALSE (0)
+#endif
+
+#ifndef NULL
 #define NULL ((void *) 0)
+#endif
+
+#ifndef ZERO
 #define ZERO ((rune_t) 0)
+#endif
 
 #endif // RR_TYPES_H