diff --git a/autoload/gitgutter/diff.vim b/autoload/gitgutter/diff.vim
index a10e69f..2cf7acf 100644
--- a/autoload/gitgutter/diff.vim
+++ b/autoload/gitgutter/diff.vim
@@ -5,6 +5,9 @@ else
   let s:grep_available = executable('grep')
   if s:grep_available
     let s:grep_command = 'grep'
+    if $GREP_OPTIONS =~# '--color=always'
+      let s:grep_command .= ' --color=never'
+    endif
   endif
 endif
 let s:hunk_re = '^@@ -\(\d\+\),\?\(\d*\) +\(\d\+\),\?\(\d*\) @@'