diff --git a/.github/workflows/pipeline.yml b/.github/workflows/pipeline.yml
index 922cee18..2e885eed 100644
--- a/.github/workflows/pipeline.yml
+++ b/.github/workflows/pipeline.yml
@@ -44,7 +44,7 @@ jobs:
           install-project: "false"
           python-version: "3.11"
 
-      - run: poetry run trial ./tests
+      - run: poetry run trial tests
 
   run-unit-tests-olddeps:
     name: Unit tests (old dependencies)
diff --git a/pyproject.toml b/pyproject.toml
index e67b0925..149283ad 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -61,6 +61,9 @@ description = "Reference Push Gateway for Matrix Notifications"
 authors = ["Matrix.org Team and Contributors <packages@matrix.org>"]
 readme = "README.md"
 license = "Apache-2.0"
+include = [
+    { path = "tests", format = "sdist" },
+]
 
 [tool.poetry.dependencies]
 python = "^3.8.0"