diff --git a/README.mkd b/README.mkd
index c49289f..9c5e48c 100644
--- a/README.mkd
+++ b/README.mkd
@@ -633,16 +633,6 @@ This plugin is for showing changes between the buffer and the index (and staging
 
 Your colorscheme is configuring the `SignColumn` highlight group weirdly.  Please see the section above on customising the sign column.
 
-> Why are the colours in the preview window weird?
-
-Probably because your colourscheme doesn't configure the `diff{Added,Changed,Removed}` highlight groups.  Try this in `after/syntax/diff.vim`:
-
-```viml
-highlight link diffAdded DiffAdd
-highlight link diffChanged DiffChange
-highlight link diffRemoved DiffDelete
-```
-
 > What happens if I also use another plugin which uses signs (e.g. Syntastic)?
 
 You can configure whether GitGutter preserves or clobbers other signs using `g:gitgutter_sign_allow_clobber`.  Set to `1` to clobber other signs (default on Vim >= 8.1.0614 and NeoVim >= 0.4.0) or `0` to preserve them.
diff --git a/autoload/gitgutter/highlight.vim b/autoload/gitgutter/highlight.vim
index aa14d3c..ed63f29 100644
--- a/autoload/gitgutter/highlight.vim
+++ b/autoload/gitgutter/highlight.vim
@@ -116,11 +116,12 @@ function! gitgutter#highlight#define_highlights() abort
   " Highlights used intra line.
   highlight GitGutterAddIntraLine    gui=reverse cterm=reverse
   highlight GitGutterDeleteIntraLine gui=reverse cterm=reverse
-  " Set default diff colours for the preview window (some colourschemes forget this).
-  " highlight default link diffAdded DiffAdd
-  " highlight default link diffChanged DiffChange
-  " highlight default link diffRemoved DiffDelete
-
+  " Set diff syntax colours (used in the preview window) - diffAdded,diffChanged,diffRemoved -
+  " to match the signs.
+  for [dtype,type] in [['Added','Add'], ['Changed','Change'], ['Removed','Delete']]
+    let [guifg, ctermfg] = s:get_foreground_colors('GitGutter'.type)
+    execute "highlight diff".dtype." guifg=".guifg." ctermfg=".ctermfg." guibg=NONE ctermbg=NONE"
+  endfor
 endfunction
 
 function! gitgutter#highlight#define_signs() abort