diff --git a/autoload/tagbar.vim b/autoload/tagbar.vim
index d948e6b..0f67dea 100644
--- a/autoload/tagbar.vim
+++ b/autoload/tagbar.vim
@@ -1367,7 +1367,7 @@ function! s:ExecuteCtagsOnFile(fname, realfname, typeinfo) abort
 
     let ctags_output = s:ExecuteCtags(ctags_cmd)
 
-    if v:shell_error || ctags_output =~? 'Warning: cannot open source file'
+    if v:shell_error || ctags_output =~? 'Warning: cannot open \(source\|input\) file'
         call tagbar#debug#log('Command output:')
         call tagbar#debug#log(ctags_output)
         call tagbar#debug#log('Exit code: ' . v:shell_error)