diff --git a/plug.vim b/plug.vim
index ab1c1f7..7772ea5 100644
--- a/plug.vim
+++ b/plug.vim
@@ -112,14 +112,17 @@ function! plug#begin(...)
   return 1
 endfunction
 
-function! s:define_commands()
-  command! -nargs=+ -bar Plug call s:add(<args>)
+function! s:git_exists()
   if !executable('git')
     return s:err('`git` executable not found. vim-plug requires git.')
   endif
+endfunction
+
+function! s:define_commands()
+  command! -nargs=+ -bar Plug call s:add(<args>)
+  command! -nargs=0 -bar -bang PlugClean call s:clean(<bang>0)
   command! -nargs=* -bar -bang -complete=customlist,s:names PlugInstall call s:install(<bang>0, [<f-args>])
   command! -nargs=* -bar -bang -complete=customlist,s:names PlugUpdate  call s:update(<bang>0, [<f-args>])
-  command! -nargs=0 -bar -bang PlugClean call s:clean(<bang>0)
   command! -nargs=0 -bar PlugUpgrade if s:upgrade() | execute 'source' s:esc(s:me) | endif
   command! -nargs=0 -bar PlugStatus  call s:status()
   command! -nargs=0 -bar PlugDiff    call s:diff()
@@ -776,6 +779,10 @@ function! s:names(...)
 endfunction
 
 function! s:update_impl(pull, force, args) abort
+  if !s:git_exists()
+    return
+  endif
+
   let args = copy(a:args)
   let threads = (len(args) > 0 && args[-1] =~ '^[1-9][0-9]*$') ?
                   \ remove(args, -1) : get(g:, 'plug_threads', 16)
@@ -1847,6 +1854,10 @@ function! s:clean(force)
 endfunction
 
 function! s:upgrade()
+  if !s:git_exists()
+    return
+  endif
+
   echo 'Downloading the latest version of vim-plug'
   redraw
   let tmp = tempname()
@@ -1880,6 +1891,9 @@ function! s:upgrade_specs()
 endfunction
 
 function! s:status()
+  if !s:git_exists()
+    return
+  endif
   call s:prepare()
   call append(0, 'Checking plugins')
   call append(1, '')
@@ -2012,6 +2026,9 @@ function! s:append_ul(lnum, text)
 endfunction
 
 function! s:diff()
+  if !s:git_exists()
+    return
+  endif
   call s:prepare()
   call append(0, ['Collecting changes ...', ''])
   let cnts = [0, 0]
@@ -2071,6 +2088,9 @@ function! s:revert()
 endfunction
 
 function! s:snapshot(force, ...) abort
+  if !s:git_exists()
+    return
+  endif
   call s:prepare()
   setf vim
   call append(0, ['" Generated by vim-plug',
@@ -2117,4 +2137,3 @@ endif
 
 let &cpo = s:cpo_save
 unlet s:cpo_save
-