diff --git a/tests/cram.py b/tests/cram.py
index e19aaf22..2a55f1c2 100644
--- a/tests/cram.py
+++ b/tests/cram.py
@@ -7,7 +7,7 @@
 topdir = testsdir.parent
 
 @pytest.mark.skipif(os.name != "posix", reason = "cram requires a POSIX platform")
-@pytest.mark.parametrize("testfile", testsdir.glob("*.cram"), ids = str)
+@pytest.mark.parametrize("testfile", list(testsdir.glob("*.cram")), ids = str)
 def pytest_cram(testfile):
     # Check the exit status ourselves for nicer test output on failure
     result = run(["cram", testfile], cwd = topdir)
diff --git a/tests/markdown.py b/tests/markdown.py
index cb6659e4..98e35a3f 100644
--- a/tests/markdown.py
+++ b/tests/markdown.py
@@ -8,10 +8,12 @@
 datadir = testsdir / "data/markdown/"
 
 def cases(pattern):
-    for case in datadir.glob(pattern):
-        yield pytest.param(
+    return [
+        pytest.param(
             case,
             id = str(case.relative_to(topdir)))
+        for case in datadir.glob(pattern)
+    ]
 
 
 @pytest.mark.parametrize("case", cases("roundtrip-*.md"))