diff --git a/tests/test_litellm/llms/bedrock/test_mantle.py b/tests/test_litellm/llms/bedrock/test_mantle.py
index f7f8f582abc..6fdc649c7db 100644
--- a/tests/test_litellm/llms/bedrock/test_mantle.py
+++ b/tests/test_litellm/llms/bedrock/test_mantle.py
@@ -215,7 +215,7 @@ def test_mantle_validate_environment_sets_workspace_header():
         optional_params={},
         litellm_params={"aws_bedrock_project_id": "proj_abc123def456"},
     )
-    assert headers["anthropic-workspace"] == "proj_abc123def456"
+    assert headers["anthropic-workspace-id"] == "proj_abc123def456"
 
 
 def test_mantle_validate_environment_without_project_id():
@@ -227,7 +227,7 @@ def test_mantle_validate_environment_without_project_id():
         optional_params={},
         litellm_params={"aws_bedrock_project_id": None},
     )
-    assert "anthropic-workspace" not in headers
+    assert "anthropic-workspace-id" not in headers
 
 
 def test_mantle_messages_validate_environment_sets_workspace_header():
@@ -240,7 +240,7 @@ def test_mantle_messages_validate_environment_sets_workspace_header():
         litellm_params={"aws_bedrock_project_id": "proj_abc123def456"},
         api_base="https://bedrock-mantle.us-east-1.api.aws/anthropic/v1/messages",
     )
-    assert headers["anthropic-workspace"] == "proj_abc123def456"
+    assert headers["anthropic-workspace-id"] == "proj_abc123def456"
     assert api_base == "https://bedrock-mantle.us-east-1.api.aws/anthropic/v1/messages"
 
 
@@ -253,7 +253,7 @@ def test_mantle_messages_validate_environment_without_project_id():
         optional_params={},
         litellm_params={},
     )
-    assert "anthropic-workspace" not in headers
+    assert "anthropic-workspace-id" not in headers
 
 
 def test_mantle_completion_sends_workspace_header_and_clean_body():
@@ -279,7 +279,7 @@ def test_mantle_completion_sends_workspace_header_and_clean_body():
     assert response.choices[0].message.content == "ok"
     assert len(requests) == 1
     assert requests[0]["path"] == "/anthropic/v1/messages"
-    assert requests[0]["headers"]["anthropic-workspace"] == "proj_abc123def456"
+    assert requests[0]["headers"]["anthropic-workspace-id"] == "proj_abc123def456"
     assert "aws_bedrock_project_id" not in requests[0]["body"]
 
 
@@ -313,7 +313,7 @@ async def test_mantle_anthropic_messages_sends_workspace_header_and_clean_body()
     assert response["content"][0]["text"] == "ok"
     assert len(requests) == 1
     assert requests[0]["path"] == "/anthropic/v1/messages"
-    assert requests[0]["headers"]["anthropic-workspace"] == "proj_abc123def456"
+    assert requests[0]["headers"]["anthropic-workspace-id"] == "proj_abc123def456"
     assert "aws_bedrock_project_id" not in requests[0]["body"]