diff --git a/.wolfssl_known_macro_extras b/.wolfssl_known_macro_extras
index d399da0ae..c7ce71064 100644
--- a/.wolfssl_known_macro_extras
+++ b/.wolfssl_known_macro_extras
@@ -947,6 +947,7 @@ __SUNPRO_CC
 __SVR4
 __TI_COMPILER_VERSION__
 __TURBOC__
+__UNIX__
 __USE_GNU
 __USE_MISC
 __USE_XOPEN2K