diff --git a/tests/small_samples/d88dbf79f1c03ac9d231408b03584e8396ab41a959edecfde86b82df8ee7c918.py b/tests/small_samples/d88dbf79f1c03ac9d231408b03584e8396ab41a959edecfde86b82df8ee7c918.py
new file mode 100644
index 0000000..310fff5
--- /dev/null
+++ b/tests/small_samples/d88dbf79f1c03ac9d231408b03584e8396ab41a959edecfde86b82df8ee7c918.py
@@ -0,0 +1,5 @@
+def test_getsource_on_class_without_firstlineno():
+    __firstlineno__ = 0
+
+    class C:
+        nonlocal __firstlineno__
diff --git a/tests/test_main.py b/tests/test_main.py
index 21b1b12..8309a71 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -1213,10 +1213,10 @@ def check_code(self, code, nodes, decorators, check_names):
                     continue
 
                 if (
-                    inst.opname == "STORE_NAME"
+                    inst.opname in ("STORE_NAME", "STORE_DEREF")
                     and hasattr(inst, "positions")
                     and inst.positions.col_offset == inst.positions.end_col_offset == 0
-                    and inst.argval in ("__module__", "__qualname__")
+                    and inst.argval in ("__module__", "__qualname__", "__firstlineno__")
                 ):
                     continue