diff --git a/stubs/rx/internal/utils.pyi b/stubs/rx/internal/utils.pyi
new file mode 100644
--- /dev/null
+++ b/stubs/rx/internal/utils.pyi
@@ -0,0 +1,21 @@
+# Stubs for rx.internal.utils (Python 3)
+#
+# NOTE: This dynamically typed stub was automatically generated by stubgen.
+
+from .exceptions import DisposedException
+from typing import Any
+
+def add_ref(xs: Any, r: Any): ...
+def adapt_call(func: Any): ...
+def check_disposed(this: Any) -> None: ...
+def is_future(p: Any): ...
+
+class TimeInterval:
+    value: Any = ...
+    interval: Any = ...
+    def __init__(self, value: Any, interval: Any) -> None: ...
+
+class Timestamp:
+    value: Any = ...
+    timestamp: Any = ...
+    def __init__(self, value: Any, timestamp: Any) -> None: ...