diff --git a/reactos/ntoskrnl/ntoskrnl.def b/reactos/ntoskrnl/ntoskrnl.def
index 2b4d0afd72c..d29a3ad8fd5 100644
--- a/reactos/ntoskrnl/ntoskrnl.def
+++ b/reactos/ntoskrnl/ntoskrnl.def
@@ -828,10 +828,12 @@ ObAssignSecurity@16
 ;ObCheckCreateObjectAccess@28
 ;ObCheckObjectAccess@20
 ObCreateObject@36
+ObDereferenceSecurityDescriptor@8
 ObFindHandleForObject@20
 ObGetObjectPointerCount@4
 ObGetObjectSecurity@12
 ObInsertObject@24
+ObLogSecurityDescriptor@12
 ObMakeTemporaryObject@4
 ObOpenObjectByName@28
 ObOpenObjectByPointer@28
diff --git a/reactos/ntoskrnl/ob/security.c b/reactos/ntoskrnl/ob/security.c
index 619dc9961b5..88dd748025e 100644
--- a/reactos/ntoskrnl/ob/security.c
+++ b/reactos/ntoskrnl/ob/security.c
@@ -253,4 +253,28 @@ NtSetSecurityObject(IN HANDLE Handle,
   return Status;
 }
 
+
+/*
+ * @unimplemented
+ */
+NTSTATUS STDCALL
+ObLogSecurityDescriptor(IN PSECURITY_DESCRIPTOR InputSecurityDescriptor,
+                        OUT PSECURITY_DESCRIPTOR *OutputSecurityDescriptor,
+                        IN ULONG RefBias)
+{
+    DPRINT1("ObLogSecurityDescriptor is not implemented!\n");
+    return STATUS_NOT_IMPLEMENTED;
+}
+
+
+/*
+ * @unimplemented
+ */
+NTSTATUS STDCALL
+ObDereferenceSecurityDescriptor(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
+                                IN ULONG Count)
+{
+    DPRINT1("ObDereferenceSecurityDescriptor is not implemented!\n");
+}
+
 /* EOF */