diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8872cd58d212c0a7da12b3d73c506449402143fe..cf7b950e618521b98231d8b0617fb225afc5139c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 1.8.3 - TBD
+
+* Set `additional_information` field in `SMB2SetInfoRequest` to a flags field rather than a single enum as per protocol docs
+
+
 ## 1.8.2 - 2021-11-03
 
 * Add missing `FileAttributes` enum values
diff --git a/smbprotocol/open.py b/smbprotocol/open.py
index f4571efe38e51436d51ea747d6212e73c5390124..afe1d55177c96b0178e5e89e0a275f65f70c8ccc 100644
--- a/smbprotocol/open.py
+++ b/smbprotocol/open.py
@@ -1037,9 +1037,9 @@ class SMB2SetInfoRequest(Structure):
                 default=96
             )),
             ('reserved', IntField(size=2)),
-            ('additional_information', EnumField(
+            ('additional_information', FlagField(
                 size=4,
-                enum_type=InfoAdditionalInformation,
+                flag_type=InfoAdditionalInformation,
             )),
             ('file_id', BytesField(size=16)),
             ('buffer', BytesField(