diff --git a/autoload/gitgutter/utility.vim b/autoload/gitgutter/utility.vim
index bacbf22..81f4a03 100644
--- a/autoload/gitgutter/utility.vim
+++ b/autoload/gitgutter/utility.vim
@@ -1,5 +1,5 @@
 function! gitgutter#utility#supports_overscore_sign()
-  if s:windows()
+  if gitgutter#utility#windows()
     return &encoding ==? 'utf-8'
   else
     return &termencoding ==? &encoding || &termencoding == ''
@@ -161,7 +161,7 @@ function! s:set_path(bufnr, path)
 endfunction
 
 function! gitgutter#utility#cd_cmd(bufnr, cmd) abort
-  let cd = s:unc_path(a:bufnr) ? 'pushd' : (s:windows() ? 'cd /d' : 'cd')
+  let cd = s:unc_path(a:bufnr) ? 'pushd' : (gitgutter#utility#windows() ? 'cd /d' : 'cd')
   return cd.' '.s:dir(a:bufnr).' && '.a:cmd
 endfunction
 
@@ -205,6 +205,6 @@ function! s:strip_trailing_new_line(line) abort
   return substitute(a:line, '\n$', '', '')
 endfunction
 
-function! s:windows()
+function! gitgutter#utility#windows()
   return has('win64') || has('win32') || has('win16')
 endfunction
diff --git a/plugin/gitgutter.vim b/plugin/gitgutter.vim
index 3d64514..c2aaf2a 100644
--- a/plugin/gitgutter.vim
+++ b/plugin/gitgutter.vim
@@ -76,6 +76,14 @@ call gitgutter#highlight#define_sign_column_highlight()
 call gitgutter#highlight#define_highlights()
 call gitgutter#highlight#define_signs()
 
+" Prevent infinite loop where:
+" - executing a job in the foreground launches a new window which takes the focus;
+" - when the job finishes, focus returns to gvim;
+" - the FocusGained event triggers a new job (see below).
+if gitgutter#utility#windows() && !gitgutter#async#available()
+  set noshelltemp
+endif
+
 " }}}
 
 " Primary functions {{{