diff --git a/pydantic_ai_slim/pydantic_ai/models/anthropic.py b/pydantic_ai_slim/pydantic_ai/models/anthropic.py
index de33a08f7a..e32888a439 100644
--- a/pydantic_ai_slim/pydantic_ai/models/anthropic.py
+++ b/pydantic_ai_slim/pydantic_ai/models/anthropic.py
@@ -776,7 +776,7 @@ def _add_cache_control_to_last_param(params: list[BetaContentBlockParam], ttl: L
 
         # Only certain types support cache_control
         # See https://docs.anthropic.com/en/docs/build-with-claude/prompt-caching#what-can-be-cached
-        cacheable_types = {'text', 'tool_use', 'server_tool_use', 'image', 'tool_result'}
+        cacheable_types = {'text', 'tool_use', 'server_tool_use', 'image', 'tool_result', 'document'}
         # Cast needed because BetaContentBlockParam is a union including response Block types (Pydantic models)
         # that don't support dict operations, even though at runtime we only have request Param types (TypedDicts).
         last_param = cast(dict[str, Any], params[-1])
diff --git a/tests/models/test_anthropic.py b/tests/models/test_anthropic.py
index 86ba5a68d3..1d0d64918f 100644
--- a/tests/models/test_anthropic.py
+++ b/tests/models/test_anthropic.py
@@ -427,9 +427,9 @@ def test_cache_control_unsupported_param_type():
 
     # Create a list with an unsupported param type (document)
     # We'll use a mock document block param
-    params: list[dict[str, Any]] = [{'type': 'document', 'source': {'data': 'test'}}]
+    params: list[dict[str, Any]] = [{'type': 'thinking', 'source': {'data': 'test'}}]
 
-    with pytest.raises(UserError, match='Cache control not supported for param type: document'):
+    with pytest.raises(UserError, match='Cache control not supported for param type: thinking'):
         AnthropicModel._add_cache_control_to_last_param(params)  # type: ignore[arg-type]  # Testing internal method