diff --git a/reactos/include/ndk/extypes.h b/reactos/include/ndk/extypes.h
index 302a44d5855..4ca7a30886d 100644
--- a/reactos/include/ndk/extypes.h
+++ b/reactos/include/ndk/extypes.h
@@ -485,6 +485,24 @@ typedef struct _CALLBACK_OBJECT
     ULONG AllowMultipleCallbacks;
 } CALLBACK_OBJECT , *PCALLBACK_OBJECT;
 
+//
+// Internal Callback Object
+//
+typedef struct _EX_CALLBACK_ROUTINE_BLOCK
+{
+    EX_RUNDOWN_REF RundownProtect;
+    PVOID Function;
+    PVOID Context;
+} EX_CALLBACK_ROUTINE_BLOCK, *PEX_CALLBACK_ROUTINE_BLOCK;
+
+//
+// Internal Callback Handle
+//
+typedef struct _EX_CALLBACK
+{
+    EX_FAST_REF RoutineBlock;
+} EX_CALLBACK, *PEX_CALLBACK;
+
 //
 // Profile Object
 //
diff --git a/reactos/include/ndk/obfuncs.h b/reactos/include/ndk/obfuncs.h
index ad54633e9c4..f8c4ad9ed8f 100644
--- a/reactos/include/ndk/obfuncs.h
+++ b/reactos/include/ndk/obfuncs.h
@@ -68,6 +68,18 @@ ObGetObjectPointerCount(
     IN PVOID Object
 );
 
+NTSTATUS
+NTAPI
+ObOpenObjectByName(
+    IN POBJECT_ATTRIBUTES ObjectAttributes,
+    IN POBJECT_TYPE ObjectType,
+    IN KPROCESSOR_MODE AccessMode,
+    IN PACCESS_STATE PassedAccessState,
+    IN ACCESS_MASK DesiredAccess,
+    IN OUT PVOID ParseContext,
+    OUT PHANDLE Handle
+);
+
 NTKERNELAPI
 NTSTATUS
 NTAPI