diff --git a/src/haiku/rag/client.py b/src/haiku/rag/client.py
index d25ddb2b..920f262a 100644
--- a/src/haiku/rag/client.py
+++ b/src/haiku/rag/client.py
@@ -88,7 +88,7 @@ class HaikuRAG:
         if not source_path.exists():
             raise ValueError(f"File does not exist: {source_path}")
 
-        uri = str(source_path.resolve())
+        uri = source_path.as_uri()
         md5_hash = hashlib.md5(source_path.read_bytes()).hexdigest()
 
         # Check if document already exists
diff --git a/tests/test_client.py b/tests/test_client.py
index 77430e24..086facc0 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -98,7 +98,7 @@ async def test_client_create_document_from_source():
 
         assert doc.id is not None
         assert doc.content == test_content
-        assert doc.uri == str(temp_path.resolve())
+        assert doc.uri == temp_path.as_uri()
         assert doc.metadata["source_type"] == "file"
         assert "contentType" in doc.metadata
         assert "md5" in doc.metadata
@@ -109,7 +109,7 @@ async def test_client_create_document_from_source():
 
         assert doc2.id is not None
         assert doc2.content == test_content
-        assert doc2.uri == str(temp_path.resolve())
+        assert doc2.uri == temp_path.as_uri()
         assert "contentType" in doc2.metadata
         assert "md5" in doc2.metadata