diff --git a/autoload/sy/repo.vim b/autoload/sy/repo.vim
index b802c3d..3bc05d7 100644
--- a/autoload/sy/repo.vim
+++ b/autoload/sy/repo.vim
@@ -465,6 +465,7 @@ let s:default_vcs_cmds = {
 let s:default_vcs_cmds_diffmode = {
       \ 'git': 'git show HEAD:./%f',
       \ 'hg':  'hg cat %f',
+      \ 'svn': 'svn cat %f',
       \ }
 
 if exists('g:signify_vcs_cmds')