diff --git a/bin/9l b/bin/9l
index 6195815f..4266b10e 100755
--- a/bin/9l
+++ b/bin/9l
@@ -40,7 +40,7 @@ case "$tag" in
 	userpath=true
 	extralibs="$extralibs -lutil -lresolv"
 	case "${SYSVERSION:-`uname -r`}" in
-	2.6.* | 3.* | 4.*)
+	2.6.* | [3-9].* | [1-9][0-9].*)
 		extralibs="$extralibs -lpthread"
 		;;
 	esac