diff --git a/setup.cfg b/setup.cfg
index 70043a99..c236305f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -125,6 +125,11 @@ line_length = 100
 multi_line_output = 3
 
 [mypy]
+explicit_package_bases = True
+mypy_path = $MYPY_CONFIG_FILE_DIR/src
+namespace_packages = True
+
+[mypy-ruamel]
 ignore_missing_imports = True
 
 [pydocstyle]