diff --git a/tests/tools/dumping/integration_tests.py b/tests/tools/dumping/test_integration.py
similarity index 99%
rename from tests/tools/dumping/integration_tests.py
rename to tests/tools/dumping/test_integration.py
index 321839f414..89d5f44be7 100644
--- a/tests/tools/dumping/integration_tests.py
+++ b/tests/tools/dumping/test_integration.py
@@ -20,6 +20,9 @@
 
 from .utils import compare_tree
 
+# Slow, DB-heavy integration tests that write full dump trees to disk; run only in nightly CI.
+pytestmark = pytest.mark.nightly
+
 logger = AIIDA_LOGGER.getChild('tools._dumping.tests')
 
 profile_dump_label = 'profile-dump'