diff --git a/tools/stubtest.py b/tools/stubtest.py
index b79ab2f40dd0..d73d966de19e 100644
--- a/tools/stubtest.py
+++ b/tools/stubtest.py
@@ -108,6 +108,7 @@ def visit_ClassDef(self, node):
         [
             "stubtest",
             "--mypy-config-file=pyproject.toml",
+            "--ignore-disjoint-bases",
             "--allowlist=ci/mypy-stubtest-allowlist.txt",
             f"--allowlist={p}",
             "matplotlib",