diff --git a/plugin/NERD_tree.vim b/plugin/NERD_tree.vim
index c1d6fe6..1c2131a 100644
--- a/plugin/NERD_tree.vim
+++ b/plugin/NERD_tree.vim
@@ -116,9 +116,9 @@ call s:initVariable("g:NERDTreeMapMenu", "m")
 call s:initVariable("g:NERDTreeMapHelp", "?")
 call s:initVariable("g:NERDTreeMapJumpFirstChild", "K")
 call s:initVariable("g:NERDTreeMapJumpLastChild", "J")
-call s:initVariable("g:NERDTreeMapJumpNextSibling", "C-j")
+call s:initVariable("g:NERDTreeMapJumpNextSibling", "<C-j>")
 call s:initVariable("g:NERDTreeMapJumpParent", "p")
-call s:initVariable("g:NERDTreeMapJumpPrevSibling", "C-k")
+call s:initVariable("g:NERDTreeMapJumpPrevSibling", "<C-k>")
 call s:initVariable("g:NERDTreeMapJumpRoot", "P")
 call s:initVariable("g:NERDTreeMapOpenExpl", "e")
 call s:initVariable("g:NERDTreeMapOpenInTab", "t")