diff --git a/include/xorg-server.h.in b/include/xorg-server.h.in
index 7b2a4d193..3c2ff470c 100644
--- a/include/xorg-server.h.in
+++ b/include/xorg-server.h.in
@@ -233,6 +233,9 @@
 /* System is BSD-like */
 #undef CSRG_BASED
 
+/* Solaris 8 or later? */
+#undef __SOL8__
+
 /* System has PC console */
 #undef PCCONS_SUPPORT