diff --git a/Makefile b/Makefile
index cc5717ef2..38887da99 100644
--- a/Makefile
+++ b/Makefile
@@ -374,6 +374,7 @@ help:
 
 lint:
 	flake8 --config=scripts/flake8.cfg test/zdtm.py
+	flake8 --config=scripts/flake8.cfg test/inhfd/*.py
 	flake8 --config=scripts/flake8.cfg test/others/rpc/config_file.py
 
 include Makefile.install