diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index dcfa203..a9390e4 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -522,7 +522,10 @@ function! s:Relative(...) abort
 endfunction
 
 function! fugitive#Route(object, ...) abort
-  if a:object =~# '^[~$]'
+  if type(a:object) == type(0)
+    let name = bufname(a:object)
+    return s:PlatformSlash(name =~# '^$\|^/\|^\a\+:' ? name : getcwd() . '/' . name)
+  elseif a:object =~# '^[~$]'
     let prefix = matchstr(a:object, '^[~$]\i*')
     let owner = expand(prefix)
     return s:PlatformSlash((len(owner) ? owner : prefix) . strpart(a:object, len(prefix)))
diff --git a/plugin/fugitive.vim b/plugin/fugitive.vim
index 8b667dd..98011b6 100644
--- a/plugin/fugitive.vim
+++ b/plugin/fugitive.vim
@@ -44,7 +44,7 @@ function! FugitiveReal(...) abort
 endfunction
 
 function! FugitiveRoute(...) abort
-  return fugitive#Route(a:0 ? a:1 : ':/', FugitiveGitDir(a:0 > 1 ? a:2 : -1))
+  return fugitive#Route(a:0 ? a:1 : bufnr(''), FugitiveGitDir(a:0 > 1 ? a:2 : -1))
 endfunction
 
 function! FugitivePath(...) abort