diff --git a/Makefile b/Makefile
index 26fe3a387..ca59d6c8a 100644
--- a/Makefile
+++ b/Makefile
@@ -51,7 +51,8 @@ lint: $(PY_SPEC_ALL_TARGETS)
 	cd $(PY_SPEC_DIR); . venv/bin/activate; \
 	flake8  --ignore=E252,W504,W503 --max-line-length=120 ./eth2spec; \
 	cd ./eth2spec; \
-	mypy --follow-imports=silent --warn-unused-ignores --ignore-missing-imports --check-untyped-defs --disallow-incomplete-defs --disallow-untyped-defs -p phase0
+	mypy --follow-imports=silent --warn-unused-ignores --ignore-missing-imports --check-untyped-defs --disallow-incomplete-defs --disallow-untyped-defs -p phase0; \
+	mypy --follow-imports=silent --warn-unused-ignores --ignore-missing-imports --check-untyped-defs --disallow-incomplete-defs --disallow-untyped-defs -p phase1
 
 install_deposit_contract_test: $(PY_SPEC_ALL_TARGETS)
 	cd $(DEPOSIT_CONTRACT_DIR); python3 -m venv venv; . venv/bin/activate; pip3 install -r requirements-testing.txt