diff --git a/drivers/filters/fltmgr/fltmgr.spec b/drivers/filters/fltmgr/fltmgr.spec
index e002d22afd1..34b7d6aee5f 100644
--- a/drivers/filters/fltmgr/fltmgr.spec
+++ b/drivers/filters/fltmgr/fltmgr.spec
@@ -19,4 +19,6 @@
  @ stdcall FltDetachVolume(ptr ptr ptr)
  @ stdcall FltGetVolumeName(ptr ptr ptr)
  @ stdcall FltGetFileNameInformation(ptr long ptr)
+ @ stdcall FltCreateCommunicationPort(ptr ptr ptr ptr ptr ptr ptr long)
+ @ stdcall FltCloseCommunicationPort(ptr)