diff --git a/pyproject.toml b/pyproject.toml
index c0f4191..50f7aac 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,5 +18,5 @@ requires = ["setuptools"]
 build-backend = "setuptools.build_meta:"
 
 [[tool.mypy.overrides]]
-module = ["pyNN.*", "quantities", "neo", "scipy", "scipy.*", "lazyarray", "IPython"]
+module = ["pyNN.*", "quantities", "neo", "scipy", "scipy.*", "lazyarray", "IPython", "matplotlib"]
 ignore_missing_imports = true