diff --git a/lib/nerdtree/ui.vim b/lib/nerdtree/ui.vim
index 358a948..dffdecd 100644
--- a/lib/nerdtree/ui.vim
+++ b/lib/nerdtree/ui.vim
@@ -532,6 +532,9 @@ endfunction
 " zoom (maximize/minimize) the NERDTree window
 function! s:UI.toggleZoom()
     if exists('b:NERDTreeZoomed') && b:NERDTreeZoomed
+        setlocal nowinfixwidth
+        wincmd =
+        setlocal winfixwidth
         call nerdtree#exec('silent vertical resize '. g:NERDTreeWinSize, 1)
         let b:NERDTreeZoomed = 0
     else