diff --git a/session.vim b/session.vim
index 1a94d6bf07..4b9dcb72c1 100644
--- a/session.vim
+++ b/session.vim
@@ -13,6 +13,8 @@ let g:syntastic_cpp_include_dirs = [
             \]
 let g:syntastic_c_include_dirs = g:syntastic_cpp_include_dirs
 
+set wildignore+=resources/viewer/mathjax/**
+
 fun! CalibreLog()
     " Setup buffers to edit the calibre changelog and version info prior to
     " making a release.