diff --git a/autoload/vundle/installer.vim b/autoload/vundle/installer.vim
index f7e4375..723406a 100644
--- a/autoload/vundle/installer.vim
+++ b/autoload/vundle/installer.vim
@@ -210,12 +210,10 @@ func! s:sync(bang, bundle) abort
     if !(a:bang) | return 'todate' | endif
     let cmd = 'cd '.shellescape(a:bundle.path()).' && git pull && git submodule update --init --recursive'
 
-    if (has('win32') || has('win64'))
-      let cmd = substitute(cmd, '^cd ','cd /d ','')  " add /d switch to change drives
-      let cmd = '"'.cmd.'"'                          " enclose in quotes
-    endif
+    let cmd = g:shellesc_cd(cmd)
 
     let get_current_sha = 'cd '.shellescape(a:bundle.path()).' && git rev-parse HEAD'
+    let get_current_sha = g:shellesc_cd(get_current_sha)
     let initial_sha = s:system(get_current_sha)[0:15]
   else
     let cmd = 'git clone --recursive '.a:bundle.uri.' '.shellescape(a:bundle.path())
@@ -246,6 +244,25 @@ func! s:sync(bang, bundle) abort
   return 'updated'
 endf
 
+func! g:shellesc(cmd) abort
+  if (has('win32') || has('win64'))
+    if &shellxquote != '('                           " workaround for patch #445
+      return '"'.a:cmd.'"'                          " enclose in quotes so && joined cmds work
+    endif
+  endif
+  return a:cmd
+endf
+
+func! g:shellesc_cd(cmd) abort
+  if (has('win32') || has('win64'))
+    let cmd = substitute(a:cmd, '^cd ','cd /d ','')  " add /d switch to change drives
+    let cmd = g:shellesc(cmd)
+    return cmd
+  else
+    return a:cmd
+  endif
+endf
+
 func! s:system(cmd) abort
   return system(a:cmd)
 endf
diff --git a/autoload/vundle/scripts.vim b/autoload/vundle/scripts.vim
index 53a77e1..64a3301 100644
--- a/autoload/vundle/scripts.vim
+++ b/autoload/vundle/scripts.vim
@@ -43,10 +43,7 @@ func! s:create_changelog() abort
           \              ' && git log --pretty=format:"%s   %an, %ar" --graph '.
           \               initial_sha.'..'.updated_sha
 
-    if (has('win32') || has('win64'))
-      let cmd = substitute(cmd, '^cd ','cd /d ','')  " add /d switch to change drives
-      let cmd = '"'.cmd.'"'                          " enclose in quotes
-    endif
+    let cmd = g:shellesc_cd(cmd)
 
     let updates = system(cmd)
 
@@ -164,7 +161,7 @@ func! s:fetch_scripts(to)
     let cmd = 'wget -q -O '.temp.' '.l:vim_scripts_json. ' && mv -f '.temp.' '.shellescape(a:to)
     if (has('win32') || has('win64')) 
       let cmd = substitute(cmd, 'mv -f ', 'move /Y ', '') " change force flag
-      let cmd = '"'.cmd.'"'                         " enclose in quotes so && joined cmds work
+      let cmd = g:shellesc(cmd)
     end
   else
     echoerr 'Error curl or wget is not available!'