diff --git a/cf/sunos.m4 b/cf/sunos.m4
index 53ad31be0..f3d46393c 100644
--- a/cf/sunos.m4
+++ b/cf/sunos.m4
@@ -11,7 +11,7 @@ case "$host" in
 *-*-solaris2.7)
 	sunos=57
 	;;
-*-*-solaris2.[[89]])
+*-*-solaris2.[[89]] | *-*-solaris2.10)
 	sunos=58
 	;;
 *-*-solaris2*)