diff --git a/.github/workflows/python-package-conda.yml b/.github/workflows/python-package-conda.yml
index 2674afdd..563cad6c 100644
--- a/.github/workflows/python-package-conda.yml
+++ b/.github/workflows/python-package-conda.yml
@@ -48,12 +48,12 @@ jobs:
       run: |
         conda install flake8
         # stop the build if there are Python syntax errors or undefined names
-        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics --exclude venv peak lassen
+        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics --exclude venv,peak,lassen
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics --exclude venv peak lassen
+        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics --exclude venv,peak,lassen
     - name: Python style checking flake8
       run: |
-        flake8 . --count --select=E,W --statistics --ignore=W503,W504 --max-line-length=127 --exclude venv peak lassen
+        flake8 . --count --select=E,W --statistics --ignore=W503,W504 --max-line-length=127 --exclude venv,peak,lassen
     - name: Check SAM Simulator generating script
       run: |
         make tests