diff --git a/baseplate/lib/propagator_redditb3.py b/baseplate/lib/propagator_redditb3.py
index 8e0ab6a1c..372b433f1 100644
--- a/baseplate/lib/propagator_redditb3.py
+++ b/baseplate/lib/propagator_redditb3.py
@@ -1,10 +1,11 @@
 import logging
+
+from re import compile as re_compile
 from typing import Any
 from typing import Iterable
 from typing import Optional
 from typing import Set
-
-from re import compile as re_compile
+from typing import Union
 
 from opentelemetry import trace
 from opentelemetry.context import Context
@@ -40,9 +41,9 @@ def extract(
     ) -> Context:
         if context is None:
             context = Context()
-        trace_id: Optional[int] = trace.INVALID_TRACE_ID
-        span_id: Optional[int] = trace.INVALID_SPAN_ID
-        sampled: Optional[int] = "0"
+        trace_id: Union[int, str] = trace.INVALID_TRACE_ID
+        span_id: Union[int, str] = trace.INVALID_SPAN_ID
+        sampled: Union[int, str] = "0"
         flags: Optional[Iterable[str]] = None
 
         trace_id = _extract_first_element(getter.get(carrier, self.TRACE_ID_KEY), default=trace_id)
@@ -154,8 +155,8 @@ def fields(self) -> Set[str]:
 
 
 def _extract_first_element(
-    items: Iterable[CarrierT],
-    default: Optional[Any] = None,
+    items: Optional[Iterable[CarrierT]],
+    default: Any,
 ) -> Optional[CarrierT]:
     if items is None:
         return default