diff --git a/autoload/gitgutter/diff.vim b/autoload/gitgutter/diff.vim
index 99fb218..6ca9f1c 100644
--- a/autoload/gitgutter/diff.vim
+++ b/autoload/gitgutter/diff.vim
@@ -19,11 +19,11 @@ function! gitgutter#diff#run_diff(realtime, use_external_grep, lines_of_context)
     let cmd .= 'git show '.blob_name.' > '.blob_file.' && '
   endif
 
-  let cmd .= 'git diff --no-ext-diff --no-color -U'.a:lines_of_context.' '.g:gitgutter_diff_args.' '
+  let cmd .= 'git diff --no-ext-diff --no-color -U'.a:lines_of_context.' '.g:gitgutter_diff_args.' -- '
   if a:realtime
-    let cmd .= '-- '.blob_file.' - '
+    let cmd .= blob_file.' - '
   else
-    let cmd .= '-- '.gitgutter#utility#shellescape(gitgutter#utility#filename())
+    let cmd .= gitgutter#utility#shellescape(gitgutter#utility#filename())
   endif
 
   if a:use_external_grep && s:grep_available