diff --git a/.wolfssl_known_macro_extras b/.wolfssl_known_macro_extras
index d9977ea3cf..583422bea4 100644
--- a/.wolfssl_known_macro_extras
+++ b/.wolfssl_known_macro_extras
@@ -1028,6 +1028,7 @@ __BORLANDC__
 __BSD_VISIBLE
 __CCRX__
 __CC_ARM
+__CHERI_PURE_CAPABILITY__
 __COMPILER_VER__
 __COUNTER__
 __CYGWIN__