diff --git a/plug.vim b/plug.vim
index 2e19f61..ab07873 100644
--- a/plug.vim
+++ b/plug.vim
@@ -777,7 +777,7 @@ function! s:job_abort()
   for [name, j] in items(s:jobs)
     silent! call jobstop(j.jobid)
     if j.new
-      call system('rm -rf ' . s:shellesc(g:plugs[name].dir))
+      call s:system('rm -rf ' . s:shellesc(g:plugs[name].dir))
     endif
   endfor
   let s:jobs = {}
@@ -1191,8 +1191,16 @@ function! s:with_cd(cmd, dir)
 endfunction
 
 function! s:system(cmd, ...)
-  let cmd = a:0 > 0 ? s:with_cd(a:cmd, a:1) : a:cmd
-  return system(s:is_win ? '('.cmd.')' : cmd)
+  try
+    let sh = &shell
+    if !s:is_win
+      set shell=sh
+    endif
+    let cmd = a:0 > 0 ? s:with_cd(a:cmd, a:1) : a:cmd
+    return system(s:is_win ? '('.cmd.')' : cmd)
+  finally
+    let &shell = sh
+  endtry
 endfunction
 
 function! s:system_chomp(...)
@@ -1280,7 +1288,7 @@ function! s:clean(force)
     if yes
       for dir in todo
         if isdirectory(dir)
-          call system((s:is_win ? 'rmdir /S /Q ' : 'rm -rf ') . s:shellesc(dir))
+          call s:system((s:is_win ? 'rmdir /S /Q ' : 'rm -rf ') . s:shellesc(dir))
         endif
       endfor
       call append(line('$'), 'Removed.')
@@ -1297,7 +1305,7 @@ function! s:upgrade()
   redraw
   try
     if executable('curl')
-      let output = system(printf('curl -fLo %s %s', s:shellesc(new), s:plug_src))
+      let output = s:system(printf('curl -fLo %s %s', s:shellesc(new), s:plug_src))
       if v:shell_error
         throw get(s:lines(output), -1, v:shell_error)
       endif
@@ -1510,7 +1518,7 @@ function! s:snapshot(...) abort
     \   ['@echo off', ':: Generated by vim-plug', ':: '.strftime("%c"), '',
     \    ':: Make sure to PlugUpdate first', '', 'set PLUG_HOME='.s:esc(home)]] :
     \ ['sh', '$PLUG_HOME',
-    \   ['#!/bin/bash',  '# Generated by vim-plug', '# '.strftime("%c"), '',
+    \   ['#!/bin/sh',  '# Generated by vim-plug', '# '.strftime("%c"), '',
     \    'vim +PlugUpdate +qa', '', 'PLUG_HOME='.s:esc(home)]]
 
   call s:prepare()
@@ -1535,7 +1543,7 @@ function! s:snapshot(...) abort
   if a:0 > 0
     let fn = s:esc(expand(a:1))
     call writefile(getline(1, '$'), fn)
-    if !s:is_win | call system('chmod +x ' . fn) | endif
+    if !s:is_win | call s:system('chmod +x ' . fn) | endif
     echo 'Saved to '.a:1
     silent execute 'e' fn
   endif
diff --git a/test/regressions.vader b/test/regressions.vader
index 3a388c9..625781b 100644
--- a/test/regressions.vader
+++ b/test/regressions.vader
@@ -201,3 +201,20 @@ Execute (#145: Merging on-demand loading triggers - map):
   Assert empty(mapcheck("<Plug>(xxx)"))
   Assert empty(mapcheck("<Plug>(yyy)"))
 
+**********************************************************************
+Execute (#159: shell=/bin/tcsh):
+  let org = &shell
+  try
+    set shell=/bin/tcsh
+    call plug#begin('$TMPDIR/plugged')
+    Plug 'junegunn/seoul256.vim'
+    call plug#end()
+
+    PlugStatus
+    Log getline(1, '$')
+    q
+    AssertEqual '/bin/tcsh', &shell
+  finally
+    let &shell = org
+  endtry
+
diff --git a/test/workflow.vader b/test/workflow.vader
index 7ecf517..cc78d51 100644
--- a/test/workflow.vader
+++ b/test/workflow.vader
@@ -1017,7 +1017,7 @@ Execute (PlugSnapshot):
   PlugClean!
   PlugInstall
   PlugSnapshot
-  AssertEqual '#!/bin/bash', getline(1)
+  AssertEqual '#!/bin/sh', getline(1)
   AssertEqual '# Generated by vim-plug', getline(2)
   AssertEqual 'vim +PlugUpdate +qa', getline(5)
   AssertEqual 'PLUG_HOME=$TMPDIR/plugged', getline(7)