diff --git a/autoload/ale/python.vim b/autoload/ale/python.vim
index 7a294e4..117b0ef 100644
--- a/autoload/ale/python.vim
+++ b/autoload/ale/python.vim
@@ -18,6 +18,7 @@ function! ale#python#FindProjectRootIni(buffer) abort
         \|| filereadable(l:path . '/setup.cfg')
         \|| filereadable(l:path . '/pytest.ini')
         \|| filereadable(l:path . '/tox.ini')
+        \|| filereadable(l:path . '/mypy.ini')
         \|| filereadable(l:path . '/pycodestyle.cfg')
         \|| filereadable(l:path . '/flake8.cfg')
             return l:path