diff --git a/stubs/rdfdb/graphfile_test.pyi b/stubs/rdfdb/graphfile_test.pyi
new file mode 100644
--- /dev/null
+++ b/stubs/rdfdb/graphfile_test.pyi
@@ -0,0 +1,8 @@
+# Stubs for rdfdb.graphfile_test (Python 3)
+#
+# NOTE: This dynamically typed stub was automatically generated by stubgen.
+
+import unittest
+
+class TestGraphFileOutput(unittest.TestCase):
+    def testMaintainsN3PrefixesFromInput(self): ...