diff --git a/admin/CPP-DEFINES b/admin/CPP-DEFINES
index b2e5bdb314a..9e656c39aa1 100644
--- a/admin/CPP-DEFINES
+++ b/admin/CPP-DEFINES
@@ -72,10 +72,12 @@ LOAD_AVE_CVT
 LOAD_AVE_TYPE
 NO_ARG_ARRAY
 NO_REMAP
-NO_SOCK_SIGIO
 VIRT_ADDR_VARIES
 WORDS_BIG_ENDIAN
 
+** Not used anymore by any port, can be cleaned up
+NO_SOCK_SIGIO
+
 ** Misc macros
 USER_FULL_NAME   If defined, overrides the default pw->pw_gecos for getting at the full user name.  Only MSDOS overrides the default.