diff --git a/include/Zycore/Defines.h b/include/Zycore/Defines.h
index 31d09a1..226d808 100644
--- a/include/Zycore/Defines.h
+++ b/include/Zycore/Defines.h
@@ -103,6 +103,9 @@
 #elif defined(sun) || defined(__sun)
 #   define ZYAN_SOLARIS
 #   define ZYAN_POSIX
+#elif defined(__HAIKU__)
+#   define ZYAN_HAIKU
+#   define ZYAN_POSIX
 #elif defined(__unix) || defined(__unix__)
 #   define ZYAN_UNIX
 #   define ZYAN_POSIX