diff --git a/SMBLibrary/NTFileStore/Structures/SecurityInformation/ACE/ACE.cs b/SMBLibrary/NTFileStore/Structures/SecurityInformation/ACE/ACE.cs
index d27f0c8..b670725 100644
--- a/SMBLibrary/NTFileStore/Structures/SecurityInformation/ACE/ACE.cs
+++ b/SMBLibrary/NTFileStore/Structures/SecurityInformation/ACE/ACE.cs
@@ -30,6 +30,8 @@ namespace SMBLibrary
             {
                 case AceType.ACCESS_ALLOWED_ACE_TYPE:
                     return new AccessAllowedACE(buffer, offset);
+                case AceType.ACCESS_DENIED_ACE_TYPE:
+                    return new AccessDeniedACE(buffer, offset);
                 default:
                     throw new NotImplementedException();
             }
diff --git a/SMBLibrary/NTFileStore/Structures/SecurityInformation/ACE/AccessDeniedACE.cs b/SMBLibrary/NTFileStore/Structures/SecurityInformation/ACE/AccessDeniedACE.cs
new file mode 100644
index 0000000..bcaa0e2
--- /dev/null
+++ b/SMBLibrary/NTFileStore/Structures/SecurityInformation/ACE/AccessDeniedACE.cs
@@ -0,0 +1,48 @@
+/* Copyright (C) 2014-2017 Tal Aloni <tal.aloni.il@gmail.com>. All rights reserved.
+ * 
+ * You can redistribute this program and/or modify it under the terms of
+ * the GNU Lesser Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ */
+using Utilities;
+
+namespace SMBLibrary
+{
+    public class AccessDeniedACE : ACE
+    {
+        public const int FixedLength = 8;
+
+        public AceHeader Header;
+        public AccessMask Mask;
+        public SID Sid;
+
+        public AccessDeniedACE()
+        {
+            Header = new AceHeader();
+            Header.AceType = AceType.ACCESS_DENIED_ACE_TYPE;
+        }
+
+        public AccessDeniedACE(byte[] buffer, int offset)
+        {
+            Header = new AceHeader(buffer, offset + 0);
+            Mask = (AccessMask)LittleEndianConverter.ToUInt32(buffer, offset + 4);
+            Sid = new SID(buffer, offset + 8);
+        }
+
+        public override void WriteBytes(byte[] buffer, ref int offset)
+        {
+            Header.AceSize = (ushort)this.Length;
+            Header.WriteBytes(buffer, ref offset);
+            LittleEndianWriter.WriteUInt32(buffer, ref offset, (uint)Mask);
+            Sid.WriteBytes(buffer, ref offset);
+        }
+
+        public override int Length
+        {
+            get
+            {
+                return FixedLength + Sid.Length;
+            }
+        }
+    }
+}