diff --git a/reactos/drivers/filters/CMakeLists.txt b/reactos/drivers/filters/CMakeLists.txt
index 6e279b484dc..2d135dd9199 100644
--- a/reactos/drivers/filters/CMakeLists.txt
+++ b/reactos/drivers/filters/CMakeLists.txt
@@ -1,2 +1,2 @@
-
+add_subdirectory(fltmgr)
 add_subdirectory(mountmgr)
diff --git a/reactos/drivers/filters/fltmgr/Object.c b/reactos/drivers/filters/fltmgr/Object.c
index f06e9e12841..adc1eb59a32 100644
--- a/reactos/drivers/filters/fltmgr/Object.c
+++ b/reactos/drivers/filters/fltmgr/Object.c
@@ -25,10 +25,10 @@
 
 
 NTSTATUS
-NTAPI
-FltObjectReference(_Inout_ PFLT_OBJECT Object)
+FLTAPI
+FltObjectReference(_Inout_ PVOID Object)
 {
-    if (!FltpExAcquireRundownProtection(&Object->RundownRef))
+    if (!FltpExAcquireRundownProtection(&((PFLT_OBJECT)Object)->RundownRef))
     {
         return STATUS_FLT_DELETING_OBJECT;
     }
@@ -37,10 +37,10 @@ FltObjectReference(_Inout_ PFLT_OBJECT Object)
 }
 
 VOID
-NTAPI
-FltObjectDereference(_Inout_ PFLT_OBJECT Object)
+FLTAPI
+FltObjectDereference(_Inout_ PVOID Object)
 {
-    FltpExReleaseRundownProtection(&Object->RundownRef);
+    FltpExReleaseRundownProtection(&((PFLT_OBJECT)Object)->RundownRef);
 }
 
 
diff --git a/reactos/drivers/filters/fltmgr/Registration.c b/reactos/drivers/filters/fltmgr/Registration.c
index a2070e5113b..851140dc7ae 100644
--- a/reactos/drivers/filters/fltmgr/Registration.c
+++ b/reactos/drivers/filters/fltmgr/Registration.c
@@ -205,6 +205,7 @@ FltUnregisterFilter(_In_ PFLT_FILTER Filter)
         Instance = CONTAINING_RECORD(CurrentEntry, FLT_INSTANCE, FilterLink);
 
         // FIXME: implement
+        (void)Instance;
 
         /* Reset the pointer and move to next entry */
         Instance = NULL;