diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index a83f9ea3b..346305aa7 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -112,4 +112,4 @@ jobs:
         AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
         AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
       run: |
-        pytest -rs -s -vv
+        pytest -rs -s -vv --basetemp="$TMPDIR"
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 000000000..ddcfaf122
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,4 @@
+[pytest]
+# do not use /tmp by default as it may be on a tempfs and our tests can
+# generate 10G images (that full of holes so not really 10G but still)
+addopts = --basetemp=/var/tmp