diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index db618756..d2ffe6df 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -37,7 +37,7 @@ jobs:
       - name: Run doctests
         run: |
           pip install -e .[test]
-          pytest --doctest-modules causalpy/
+          pytest --doctest-modules --ignore=causalpy/tests/ causalpy/
       - name: Run tests
         run: |
           pip install -e .[test]
diff --git a/Makefile b/Makefile
index 999818e3..8d0ee749 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ check_lint:
 
 doctest:
 	pip install causalpy[test]
-	pytest --doctest-modules causalpy/
+	pytest --doctest-modules --ignore=causalpy/tests/ causalpy/
 
 test:
 	pip install causalpy[test]