diff --git a/tests/stubs_check.py b/tests/stubs_check.py
index 8cb07c0..2f71c85 100644
--- a/tests/stubs_check.py
+++ b/tests/stubs_check.py
@@ -34,6 +34,8 @@ def visit_ClassDef(self, node: ast.ClassDef):
         self.current_cls = None
 
     def visit_FunctionDef(self, node: ast.FunctionDef):
+        if node.name == "_unstable":
+            return
         func = getattr(self.current_cls or self.module, node.name)
         if node.name.startswith("__") or node.name.endswith("serializer"):
             pass
diff --git a/zenoh/__init__.py b/zenoh/__init__.py
index e89c094..cbccd94 100644
--- a/zenoh/__init__.py
+++ b/zenoh/__init__.py
@@ -17,7 +17,3 @@
     from . import ext
 except ImportError:
     pass
-
-
-def _unstable(item):
-    return item