diff --git a/tests/test_litellm/anthropic_interface/test_rust_bridge_messages.py b/tests/test_litellm/anthropic_interface/test_rust_bridge_messages.py
index 527c43cd11f..3e0092fd376 100644
--- a/tests/test_litellm/anthropic_interface/test_rust_bridge_messages.py
+++ b/tests/test_litellm/anthropic_interface/test_rust_bridge_messages.py
@@ -213,12 +213,13 @@ async def test_amessages_wrapper_forwards_args():
         custom_llm_provider="azure_ai",
         extra_headers=None,
         timeout=12.5,
+        aws_region_name="us-east-1",
     )
 
     assert response == FAKE_MESSAGES_RESPONSE
     assert bridge.calls[0]["model"] == "claude-sonnet-4-5"
     assert bridge.calls[0]["timeout_seconds"] == 12.5
-    assert bridge.calls[0]["aws_region_name"] is None
+    assert bridge.calls[0]["aws_region_name"] == "us-east-1"
 
 
 def _gate(**overrides):
@@ -257,6 +258,31 @@ async def test_gate_invokes_rust_and_marks_response_header():
     assert call["aws_region_name"] is None
 
 
+@pytest.mark.asyncio
+async def test_gate_invokes_rust_for_bedrock_and_forwards_region():
+    bridge = RecordingAsyncMessages()
+    litellm.use_litellm_rust(True, amessages=bridge)
+
+    response = await _gate(
+        custom_llm_provider="bedrock",
+        litellm_params=GenericLiteLLMParams(
+            api_key="bedrock-token",
+            aws_region_name="us-east-1",
+            rust=True,
+        ),
+        model="bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0",
+        api_key="bedrock-token",
+        api_base=None,
+        headers={},
+    )
+
+    assert response is not None
+    assert response["_hidden_params"]["additional_headers"] == {"x-litellm-rust": "true"}
+    assert bridge.calls[0]["model"] == "bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0"
+    assert bridge.calls[0]["custom_llm_provider"] == "bedrock"
+    assert bridge.calls[0]["aws_region_name"] == "us-east-1"
+
+
 @pytest.mark.asyncio
 async def test_gate_falls_back_to_python_when_bridge_raises():
     bridge = RaisingAsyncMessages()