diff --git a/lib/bashrc.d/bash_completion.nutools b/lib/bashrc.d/bash_completion.nutools
index 5d50c25..837283f 100644
--- a/lib/bashrc.d/bash_completion.nutools
+++ b/lib/bashrc.d/bash_completion.nutools
@@ -1,6 +1,15 @@
 # -*- coding: utf-8 mode: sh -*- vim:sw=4:sts=4:et:ai:si:sta:fenc=utf-8
+##@before *
 
-[ -n "$BASH_COMPLETION" ] || source "@@dest@@/ulib/bash_completion"
+if [ -z "$BASH_COMPLETION" ]; then
+    [ "${BASH_VERSINFO[0]}" -ge 3 -a "${BASH_VERSINFO[1]}" -ge 2 ] && __bash32=1 || __bash32=
+    [ "${BASH_VERSINFO[0]}" -ge 4 ] && __bash40=1 || __bash40=
+    if [ -n "$__bash32" -o -n "$__bash40" ]; then
+        source "@@dest@@/ulib/bash_completion"
+    fi
+    unset __bash32
+    unset __bash40
+fi
 if [ -n "$BASH_COMPLETION" ]; then
     if [ -n "$BASH_COMPLETION_DIR" -a -f "$BASH_COMPLETION_DIR/ssh" ]; then
         shopt -u hostcomplete