diff --git a/pyproject.toml b/pyproject.toml
index e44afe37e0..6470c4626a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,6 +50,7 @@ max-complexity = 40
 # manifest.py files are evaluated with some global names pre-defined
 "**/manifest.py" = ["F821"]
 "ports/**/boards/**/manifest_*.py" = ["F821"]
+"ports/**/mcu/**/manifest_*.py" = ["F821"]
 
 [tool.ruff.format]
 # Exclude third-party code, and exclude the following tests: