diff --git a/tableauserverclient/models/datasource_item.py b/tableauserverclient/models/datasource_item.py
index 5a867135c..fb2db6663 100644
--- a/tableauserverclient/models/datasource_item.py
+++ b/tableauserverclient/models/datasource_item.py
@@ -47,6 +47,7 @@ def __init__(self, project_id: Optional[str] = None, name: Optional[str] = None)
         self._initial_tags: Set = set()
         self._project_name: Optional[str] = None
         self._revisions = None
+        self._size: Optional[int] = None
         self._updated_at = None
         self._use_remote_query_agent = None
         self._webpage_url = None
@@ -182,6 +183,10 @@ def revisions(self) -> List[RevisionItem]:
             raise UnpopulatedPropertyError(error)
         return self._revisions()
 
+    @property
+    def size(self) -> Optional[int]:
+        return self._size
+
     def _set_connections(self, connections):
         self._connections = connections
 
@@ -217,6 +222,7 @@ def _parse_common_elements(self, datasource_xml, ns):
                 updated_at,
                 use_remote_query_agent,
                 webpage_url,
+                size,
             ) = self._parse_element(datasource_xml, ns)
             self._set_values(
                 ask_data_enablement,
@@ -237,6 +243,7 @@ def _parse_common_elements(self, datasource_xml, ns):
                 updated_at,
                 use_remote_query_agent,
                 webpage_url,
+                size,
             )
         return self
 
@@ -260,6 +267,7 @@ def _set_values(
         updated_at,
         use_remote_query_agent,
         webpage_url,
+        size,
     ):
         if ask_data_enablement is not None:
             self._ask_data_enablement = ask_data_enablement
@@ -297,6 +305,8 @@ def _set_values(
             self._use_remote_query_agent = str(use_remote_query_agent).lower() == "true"
         if webpage_url:
             self._webpage_url = webpage_url
+        if size is not None:
+            self._size = int(size)
 
     @classmethod
     def from_response(cls, resp: str, ns: Dict) -> List["DatasourceItem"]:
@@ -330,6 +340,7 @@ def _parse_element(datasource_xml: ET.Element, ns: Dict) -> Tuple:
         has_extracts = datasource_xml.get("hasExtracts", None)
         use_remote_query_agent = datasource_xml.get("useRemoteQueryAgent", None)
         webpage_url = datasource_xml.get("webpageUrl", None)
+        size = datasource_xml.get("size", None)
 
         tags = None
         tags_elem = datasource_xml.find(".//t:tags", namespaces=ns)
@@ -372,4 +383,5 @@ def _parse_element(datasource_xml: ET.Element, ns: Dict) -> Tuple:
             updated_at,
             use_remote_query_agent,
             webpage_url,
+            size,
         )
diff --git a/test/assets/datasource_get.xml b/test/assets/datasource_get.xml
index 951409caa..1c420d116 100644
--- a/test/assets/datasource_get.xml
+++ b/test/assets/datasource_get.xml
@@ -2,12 +2,12 @@
 <tsResponse xmlns="http://tableau.com/api" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://tableau.com/api http://tableau.com/api/ts-api-2.3.xsd">
     <pagination pageNumber="1" pageSize="100" totalAvailable="2" />
     <datasources>
-        <datasource id="e76a1461-3b1d-4588-bf1b-17551a879ad9" name="SampleDS" contentUrl="SampleDS" description="SampleDsDescription" type="dataengine" createdAt="2016-08-11T21:22:40Z" updatedAt="2016-08-11T21:34:17Z" encryptExtracts="false" hasExtracts="true" useRemoteQueryAgent="false" webpageUrl="https://web.com">
+        <datasource id="e76a1461-3b1d-4588-bf1b-17551a879ad9" name="SampleDS" size="4096" contentUrl="SampleDS" description="SampleDsDescription" type="dataengine" createdAt="2016-08-11T21:22:40Z" updatedAt="2016-08-11T21:34:17Z" encryptExtracts="false" hasExtracts="true" useRemoteQueryAgent="false" webpageUrl="https://web.com">
             <project id="ee8c6e70-43b6-11e6-af4f-f7b0d8e20760" name="default" />
             <owner id="5de011f8-5aa9-4d5b-b991-f462c8dd6bb7" />
             <tags />
         </datasource>
-        <datasource id="9dbd2263-16b5-46e1-9c43-a76bb8ab65fb" name="Sample datasource" description="description Sample" contentUrl="Sampledatasource" type="dataengine" createdAt="2016-08-04T21:31:55Z" updatedAt="2016-08-04T21:31:55Z" encryptExtracts="true" hasExtracts="false" useRemoteQueryAgent="true" webpageUrl="https://page.com">
+        <datasource id="9dbd2263-16b5-46e1-9c43-a76bb8ab65fb" name="Sample datasource" description="description Sample" size="10240" contentUrl="Sampledatasource" type="dataengine" createdAt="2016-08-04T21:31:55Z" updatedAt="2016-08-04T21:31:55Z" encryptExtracts="true" hasExtracts="false" useRemoteQueryAgent="true" webpageUrl="https://page.com">
             <project id="ee8c6e70-43b6-11e6-af4f-f7b0d8e20760" name="default" />
             <owner id="5de011f8-5aa9-4d5b-b991-f462c8dd6bb7" />
             <tags>
@@ -17,4 +17,4 @@
             </tags>
         </datasource>
     </datasources>
-</tsResponse>
\ No newline at end of file
+</tsResponse>
diff --git a/test/test_datasource.py b/test/test_datasource.py
index f258fdc52..624eb93e1 100644
--- a/test/test_datasource.py
+++ b/test/test_datasource.py
@@ -52,6 +52,7 @@ def test_get(self) -> None:
         self.assertEqual("dataengine", all_datasources[0].datasource_type)
         self.assertEqual("SampleDsDescription", all_datasources[0].description)
         self.assertEqual("SampleDS", all_datasources[0].content_url)
+        self.assertEqual(4096, all_datasources[0].size)
         self.assertEqual("2016-08-11T21:22:40Z", format_datetime(all_datasources[0].created_at))
         self.assertEqual("2016-08-11T21:34:17Z", format_datetime(all_datasources[0].updated_at))
         self.assertEqual("default", all_datasources[0].project_name)
@@ -67,6 +68,7 @@ def test_get(self) -> None:
         self.assertEqual("dataengine", all_datasources[1].datasource_type)
         self.assertEqual("description Sample", all_datasources[1].description)
         self.assertEqual("Sampledatasource", all_datasources[1].content_url)
+        self.assertEqual(10240, all_datasources[1].size)
         self.assertEqual("2016-08-04T21:31:55Z", format_datetime(all_datasources[1].created_at))
         self.assertEqual("2016-08-04T21:31:55Z", format_datetime(all_datasources[1].updated_at))
         self.assertEqual("default", all_datasources[1].project_name)